What are Blood Types?

[@rileymay]

An entire hour and a half of Biology, condensed into 3 minutes... The scary part is that I think Michael did it better than the class did. Great job guys!

[@jcepri]

I understood exactly 2%

[@Blueblazezzz]

As someone who has worked as a lab tech at a blood bank for 10 years, I can honestly say this video does a great job of giving a basic overview of blood types. It is complicated stuff, and I haven't seen many videos that do a good job at explaining it.

[@BinkieMcFartnuggets]

I look to a day when people will not be judged by the color of their skin, but by the content of their antigens.

[@kirat147]

you antigen-ist!

[@RyanType]

I see you everywhere and I still laugh at that picture

[@Neueregel]

Color is a matter of fact in reality. You cannot deny it, unless you turn a blind eye on. And I judge everything I see, that's my human right.

[@AnUntitledStory]

Human ability, not human right.

[@Qsdd0]

This actually happened/happens in Japan, there were similar theories to the race theories in Japan. I believe A was ideal, B was bad, O was noble and AB was dreadful. It's now connected to personalities, kinda of like zodiacs, and you'll often find blood types included in facts about celebrities, politicians and even anime characters.

[@PIKACHUPOWNES]

As an O- Person, I sincerely hope I NEVER need blood.

[@ze_rubenator]

You'll be fine, but you really should donate blood.

[@user-mh2bw4hu3o]

YYAY mah mom told meh that I'm o-

[@glorvalmacglorvas171]

Or store up your own blood if you ever need more XD

[@JoshuaDelgado5]

PIKACHUPOWNES I got you.

[@Lukenallen8]

Deputy-Marshmallow O is the most common blood type, you are fine dude

[@draconianking]

O Negative master race reporting in.

[@DroidFreak36]

Pshh, blood is so overrated. Electricity conveys energy much more efficiently.

[@DanieleGiorgino]

Get your ass to a blood donor clinic and stop hogging all that precious blood.

[@xXSlytzerXx]

Yeah, good for you, but I can refuel with any type of blood, I consider that as more useful to me personally. You should be donating regularly...

[@draconianking]

I do donate regularly. I consider it a civic duty.

[@ChekhovsGun_]

xXSlytzerXx spoken like a true frontline soldier

[@RedrunLoL]

When I first received my blood card and it said "B+", I somehow interpreted that as the card telling me to "be positive", thanks based blood type

[@CariBaez]

Red lol

[@thomasthetankengine2653]

Me too

[@rickreed123]

My blood is ABBA, and I am digging the dancing queen.

[@stevensurack2923]

My favorite color is blood.

[@Aisha-721]

I love that group, but I don't have a B antigen. I have A+ blood. I wish I could have that on my report card.

[@ThugMuffinification]

I wonder how the process was when doctors/scientists first started doing transfusions and figuring out what's in blood and how the different types vary. I wonder if they first just used any blood for transfusions and found out that way that not all blood is compatible with other blood. Its crazy just how many things we've been able to learn and discover. Freakin fascinating!

[@IBC916]

Being O negative really sucks, you can pretty much donate to almost anybody but on a a few can donate to us.

[@batman0dino]

You can only receive O- if you have O- .

[@RyanMathewHarding]

Aidan Fox Anybody could receive O-, but I doubt the hospitals would actually give it to you unless you were O- yourself because of its rarity.

[@wei495]

No, you're still the universal recipient for plasma...

[@kirat147]

Ryan Harding hospitals will use O- blood in case of emergency transfusions like in the case of near fatal accident victims where they don't have enough time to determine the blood type

[@RyanMathewHarding]

kirat147 Oh, that's a really good point. Assuming they *do* know your blood type though, I would assume they would hold onto the O- for emergency situations.

[@meh27000]

as a medical technologist who finds it hard to simplify the world of blood banking to inquiring minds, this was an incredible recap!!

[@a.nahari380]

A+, both in my blood and my college transcript

[@lrebecca9398]

lol

[@Tyree101]

Still want get you competitive advantage in this today's job market.

[@XxAzureNekoxX]

Same

[@SpaceDwarfNova]

Yay a fellow A+ blood type 🤣

[@DrumVibes]

Hello my fellow A+ humans

[@cantafforddiamonds5026]

We used to tease my mom about her blood type being O- her mother died giving birth to her last child and bled to death because at the time(1959) they didn't have her blood type readily available. We stopped teasing her after she kept loosing babies because the of the Rh miss match. She got the shot for it and every time a miscarriage. So she had me first and then my brother, I was lucky enough to be A+ but my brother is a negative Rh. The doctor told my brother the more rare your blood type,the harder it is to find donor's for you. My brother fought bone cancer and lost. People with Rh- blood should be organ donors as well. Im surprised that Rh- is not completely extinct, being so difficult to find and seemingly weaker in general. I work with a woman now who lost a son to hemophilia, he was 14 and B-. They just couldn't find donor's on a regular basis. Now when I hear some one say" I have a rare blood type" I just think "Aww, your fucked if you get hurt and need blood ,want to have kids you better hope for a matching Rh factor, need an organ transplant well start asking family first. It just sucks watching friends and family die because thier blood is to odd and couldn't be easily found. My brother left behind a son hes 26-years-old now and donates blood regularly and is an organ donor. He is also has B - blood.

[@michaeljosephjackson6306]

oh :(

[@452xi]

I have O neg , so this comment made feel bad coz I could of helped. I am lucky coz my mum has O neg too.

[@cantafforddiamonds5026]

+Eliza Lopez Don't feel bad about it. Your mom was able to have you just fine and not every one has to deal with a medical crisis. At least you are aware of possible issues so if you're going to have children just let the doctors know. If we knew then the things we know now every thing could have been different. You're lucky to be alive now with new up dated medical care and knowledge. No worries and be safe.

[@Phoenixx-vy7ln]

lol

[@sapphirII]

I have a rare blood type too. I'm AB. However, even if I'm Rh+ I still go frequently give blood.(so often, I need to take iron pills to have an acceptable amount of iron according to the blood centers(about 3-4 times a year, maybe more)

[@martinicc67]

RH factor ca also be dangerous for childbirth. If the father is positive and mother negative if there is a second pregnancy the fetus might get regected

[@TheVinster177]

I wonder how big of a chance. My father is A+ and my mother A-. I'm A- (first) and my brother is A+ (second).

[@martinicc67]

Well you might not get a second RH+ brother... at least a fully developed living one

[@rafagd]

Also the mother can take a vaccine after the first child to reduce the risks, if I'm not mistaken.

[@MusicLover7545]

TheVinster17 They've got vaccines now that are given to the mother to prevent her blood making antibodies against the child's blood type.

[@mrtalos]

Yeah. My mother had this thankfully, otherwise I might not be here.

[@amandawarner3780]

I found out my dad wasn't my biological dad when I learned about blood types in AP Biology in 12th grade. My dad is AB-, and I'm O+, asked my mom about it and she said "Oh yeah, uhm, your dad is sterile because he had the mumps when he was 17, so you and your brother came from a donor." Thanks, Mom...

[@ze_rubenator]

He's still your dad. Shouldn't make a difference.

[@amandawarner3780]

No, doesn't make any difference. Just something you can figure out from blood types...

[@rafaeldominguez4355]

Amanda Warner so u get your blood type from your dad?

[@amandawarner3780]

Your blood type is determined by both parents. Here is a calculator: www.endmemo.com/medical/bloodtype.php My mom is B+, my dad is AB-, and I am O+, so it is impossible for my dad to be my biological dad. Statistically, the person who gave the donor bank his sperm which ultimately led to me was probably O+.

[@sapphirII]

He could have been anywhere in O, A and B, and negative or positive. You could have gotten the O gene from both your mom and the donor and gotten the Rh+ from your mom and the Rh- gene from him though.

[@arwahammuda9780]

I studied this in high school but it still fascinates me every time I think of it, subhana Allah

[@GothicSilverWolf666]

Ahh....O- blood type makes me a universal donor so I feel an obligation to give blood as often as I possibly can. Sucks that accepting blood is a pain for me, but oh well, I'm doing some good ^_^

[@bonvivant55]

For blood, not plasma.

[@dallen3000]

bon vivant he didnt say anything about plasma...

[@bonvivant55]

Well, yes and no. He talked a lot about it without actually mentioning the word. When we talk about giving blood, it's actually washed, packed, red blood cells. The antibodies are in the plasma (anticoagulant + centrifugation), and to be a universal plasma donor, you'd need to be AB pos. Types like this rarely make antibodies that would actually cause a HTR in a person who has not received a transfusion in the past. The video is a really great over view though.

[@koala5065]

bon vivant I was about to say the same thing :D but I didn't know how to say it like this

[@kirat147]

bon vivant they do have full blood bags though (rbc + plasma)

[@angelcollina]

I'd be really interested in having blood factors explained. For example, I'm O+ but my blood is marked as a rare blood type because I have this alphabet-soup like list of rare or uncommon factors in my blood. Also, great video, Michael Aranda! :3

[@heatherwanderer777]

Do you have what they call "precious baby blood"? I went to donate one time and I had some marker or something and they said I was fine for normal adults, but that they look for you to not have antibodies or to have antibodies or something specific for baby transfusions...I thought it was a weird thing but all these factors and antigens ect...I'm like what do I know?l

[@angelcollina]

heatherwanderer777 I'm not sure. When I ask and show my card that has all of my factor numbers and letters, no one can explain to me what exactly they mean. But whenever I give blood, I always show it to the Red Cross people so that they can note it on my blood bag (though, I'm sure it's recorded in the system too). I'd love to know if I could help a specific group of people, like babies. I'd go out of my way to make sure they got my blood where they needed it.

[@tsssil]

Well there are like 26 other blood groups. And we're all either positive or negative for them. that's where the alphabet soup comes from. It's just probable that you lack a certain common type. So like let's so someone is transfused, and because a certain antigen is really common, that person develops and antibody to that super common antigen that was transfused into them. So then you come along, and you lack that antigen, which means that you can be a donor for that person. Which is great for that person, y'know? Baby blood just has to be fresh, CMV negative, Sickle antigen negative and a few other things. But the freshness is the main thing. It's not like only ~some people~ can donate to them or anything :)

[@heatherwanderer777]

Rainbow Fish maybe CMV is common around here, cause the blood bank sure made it seem like baby blood donors were hard to come by.

[@The.HarroweD]

I wonder if it was this guy's decision to take his ear-jewelry out, or a suggestion from Hank. Either way, if they're staying out, we're gonna have to deal with him having a cat's butthole on each earlobe for a little while.

[@Ravenclaw1991]

You're complaining about the holes in Michael's ears? Seriously?

[@The.HarroweD]

RavenclawTimeLord Could you please point out to me where you saw a complaint?

[@darrencarpenter5001]

The shit you should be focusing on instead of pointing out dumbass things like he is not wearing plugs. Ffs man does it matter?

[@aejlindvall]

***** Well, you called it a "cat's butthole". Or is that some new, fashionabel complement?

[@The.HarroweD]

Emma Lindvall It's not a *compliment, or an insult, it's an observation. I have my ears stretched, and so do a few of my friends, and that's simply what it looks like when you take them out and let them heal. You can calm down now.

[@kilgorcjk]

AB+ UNITE! We can take any blood >:)

[@serenity7185]

+kilgorcjk nothing can stop us Muahahaha xDD

[@Nicken0o0]

Yayyyyyy!!! We are team AB+!!! Wait, wait.. I don't know whether I'm positive or negative yet.. Noooooo

[@ryanchen4339]

kilgorcjk stapt it vampires, *screams

[@xtremej2575]

Hell yeah! Best blood type for sure

[@SpaceDwarfNova]

🤣 I may not be in the AB+ club but I am A+ 🤣

[@KianPalmer]

I'm AB+, does this mean I can be a vampire?

[@RumTumTuggy]

That means you are "the product of 'evolution' "

[@nightchaser95]

This is really a good video. Cleared up my confusion about blood types. :D

[@monnae]

Why is this man so handsome? Thank you for helping me understand one of the concepts that would always mess me up during my time at uni.

[@S3PT1M1]

so, im fairly sure im 0- does that basically mean im fucked if i ever need a blood transfusion :/

[@kirat147]

worry not, most hospitals have O- supplies and always try to keep them in stock. You could also donate your blood. who knows if you might be giving yourself blood in the future (knock on wood). plus, you would be helping A LOT of people out there

[@S3PT1M1]

kirat147 good point :P

[@MasterAsra]

S3PT1M1 Many blood drives tend to pamper people with O- blood too.

[@hquinn96]

Basically- it's the most unequal of the blood donation/ receiving relationships- can give to anyone, but can only receive from fellow o-negatives.

[@nerdra]

Don't worry! While everyone can accept your blood, exact-match is generally preferred in a transfusion situation, and blood banks do their darndest to keep everybody stocked against disasters for each type (i.e. other patients probably aren't hogging up your supply except in emergencies when their own type runs dry or things happen too quickly for caregivers to type them). Plus, 6% of the US population is relatively rare compared to most of the Rh+ types, BUT there are still about 5 times more of you O- folks than my type (B-), and you out-number AB- by 11 times. You're still the 4th most common of the 8 types. Further good news: you can accept plasma from anyone or their grandmother! Yay! :)

[@WyrmofAir]

Hank, I know you can't be everywhere at once but I really like listening you you. Some people just don't keep my attention, and I have to watch the video four or five times before I can understand what's actually being said. (I hate having a problem with lexical ambiguity). Thank you.

[@Zeldur]

So what this boils down to is if you have AB+, you're in great shape if you need blood. If you're O-, like me, you better hope there's O- blood when you need it. Donate blood as many times as you can. If you're O-, the blood centers love you btw.

[@30016463]

Mu lecturer never explained it that simply and I never understood it until now. Thanks guys

[@chins4tw]

19 almost 20 still don't know my blood type...

[@samuelsvard5023]

Get it checked out! It could mean the difference between life or death!

[@megreilly1193]

If you donate blood, the Red Cross will give you a donor card with your type on it. This is helpful to keep in your wallet in case you're in a situation where you're unconscious and need blood asap

[@lilbihxxx1234]

chins4tw I'm 17 and I dont know my blood type either...

[@jadonbertholf547]

18 and no idea on my blood type...

[@saniyamoosvi2169]

15 and know my blood type :P

[@PuppyThief]

Wow, this was super cool, best QQ yet!! I've been confused about he whole blood types thing for a long time! Great explanation :D

[@hokiepokie333_CicadaMykHyn]

My blood type is HIV+, so that means I can donate to everyone...

[@Peng_Pong]

I think they won't let you donate blood infected with HIV unless they also have HIV

[@hokiepokie333_CicadaMykHyn]

Penguin Gaming™ My blood is red, so they don't discriminate.... Now if I were to disclose the fact that I'm an alien and work for the CIA, they might get leary.

[@marielouis6298]

wtf

[@hokiepokie333_CicadaMykHyn]

blackwidow I only donate blood, to pay for my hookers and coke!

[@lilbihxxx1234]

hokiepokie ummm

[@ViolettaSachra]

Aaaah, thanks for this video!! I can never wrap my head around the "who can give blood to whom" thingie, so I'll have to watch this vid everyday til I can say it by heart... you rock!

[@Borzogo]

I'm puzzled! What's the evolutionary advantage in all of this? Why would humans and other animals evolve like that?!

[@BIkaloss]

To make it harder for a single Virus/bacteria to wipe out humanity.

[@alejandrinos]

Some traits are random, and don't get naturally selected out because they aren't harmful nor beneficial for the species.

[@Borzogo]

BIkaloss Interesting idea. Do you know if there are viruses and/or bacteria that target people with a specific blood type?

[@Narnendil]

I've been waiting for this one, thank you!

[@deet0109mapping]

I got an A+ on my blood test

[@treeerickson7143]

deet0109 im a-

[@ccmmacaroon2696]

@@treeerickson7143 Im also A-

[@DarylVanHumbeck]

Fascinating. I've never heard it described like this, it makes it so easy to understand!

[@salvadorcastro4733]

AB+ here, having a rare type makes me feel special(in a good way) where are my fellow ABs at?

[@arbialba]

Me wassuppp

[@Noname-qe3fg]

Same I’m also AB+

[@ellis0896]

I wish I could remember everything properly in this video, I'll have to watch it about 5 times to memorize it also this guy has very happy looking eyes, I bet when he's sad he still looks happy!

[@Slithy]

I'm O+ The world will never run out of blood for me, hah.

[@BrainBomb]

same here :)

[@RedRogue]

Woopsie daisy, actually you can only get O+ and O-. If you were AB+, THEN you'd have unlimited blood access.

[@Ybalrid]

You have to be AB+ to receive any kind of blood. An O+ can receive O+ or O- blood. But, we can give your blood to A+, B+, AB+ and of course O+. An universal donor is O-, they can give blood to anybody. But they can receive Blood only from another O-

[@Slithy]

Red Rogue I meant that O+ is the most common. I think about 40% of the people in the world are O+.

[@zedek_]

You've misunderstood. O+ is good at *donating* blood... not receiving. You are only able to receive O+ or O- blood from donors. It is people who are AB+ that can accept blood from everyone.

[@Pliskkenn]

Didn't know about them only being able to accept it once, that's rather cool.

[@SwatPooky95]

this video was literally the equivalent of 2-3 weeks of biology i had in highschool, cant believe my teacher couldnt be clear as him, and my first language is french lol

[@MsBananaMonkey100]

aww man I just had a test on this today! if only this video was posted a little earlier... awesome video!! :)

[@LanttuLoL]

oh, 0:15 no, every immune system doesn't work equally well, that's why we have for example auto-immune diseases...

[@LanttuLoL]

Good video though, just one bad word choice =D

[@samkadel8185]

Yeah, I was annoyed by that because I have Type one Diabetes. (That's the kind that is caused by having all of your insulin-producing cells destroyed and the chances of getting it are not increased by weight gain.)

[@valrp2902]

I've just made my biology test on that subject... just 2 hours before the video was released... AAAAAAHHHHHHHH!!!!!!! But thanks, these videos have always helped at school and when I shout things I learn here my classmates are like NEERD!! :)

[@ninboy01]

I'm an O+ I get spamed with messages by the Red Cross when its around the time for me to donate again.

[@NightOasis]

Lol me too

[@bjornsteelside]

O+ is pretty common but for matter so is spam

[@ninboy01]

I have an iron overload in my blood, so my blood is a good source for those suffering anemia. The last three units I donated went to anemia patients.

[@brelove5613]

O- right here

[@rsoubiea]

NINmann01 i am o+ as well.

[@IronVicero]

Why do people dislike like this video? It's clear, concise and I actually learned something. My faith in humanity increase by the video itself is slightly less for it :(

[@MrRamziaB]

There are actually about 28 blood types with several that are undeterminable. I for instince: I have to donate my own blood several times a year to myself. (Bagged and stored at the local hosp) In the case that I get hurt, and need blood, I can only use my own, and no one can use my blood. (My Dr loves this because it's something that HE hasnt seen before.) This video should be amended to say there are 8 COMMON blood types.

[@saikoujikan]

Are you Bombay type?

[@MrRamziaB]

saikoujikan On my chart it has me listed as type Z. when I asked what that meant, the Dr said "It means you better have extra blood on hand if you get hurt."

[@mhamblin]

It's probably RzRz rare blood type.

[@18aidanme]

That sucks, you can't donate blood to other people and you can't get your own blood.

[@MrRamziaB]

18aidanme I cant donate to others, and I can ONLY use my own.

[@mdenouden3y6]

Awesome episode guys!! Very interesting!

[@Shahzad-Khan]

I learned this in high school. Guess school was kinda useful.

[@walmartsuxhard]

Yay i suggested this a few vids back! Thx for reading comments scishow

[@GreggaraZZi]

I finally understand it all!

[@CherylHewitt]

Finally, an understandable explanation

[@Revilik]

Cheryl Hewitt An explanation I can understand, finally!

[@stuvs830]

I'm a "Walking Blood Bank" donor at my local hospital, where I donate whole blood. Proud moment when they called me in to donate to someone needing a transfusion. It's easy to get screened, and the staff is so nice. And there are free snacks! How many Nerdfighters will join me? 😊

[@PetersGameChannel]

im AB pos so i can get blood from everyone but i can only give blood to one

[@shoopdapoop7803]

Helpful if you're in a car crash.

[@PetersGameChannel]

true that

[@alejandrinos]

Nope. If you are in a car crash and injured so badly that you need a blood transfusion, they'll give you O- blood just to be sure, because there's no time to check your bloodtype.

[@PlayerTwoHasJoined]

I'm O-, I can give blood to everyone, but can't accept any except my own. :P

[@iwishbelongstoapple]

PlayerTwoHasJoined apart from O- You're also quite rare so congratulations!

[@rossheintzkill4848]

Absolutely terrific. Maybe a bit more on antigens, antibodies and how they actually function. But for a quick answer, very well done.

[@xm377Moyocoyatzin]

I have no idea what the fuck this guy just said.

[@BillyManchisi]

I have no idea about this blood type. Real real functional go attack people after doing useless research on blood type. Am I bothering you? jerk. I am a capable unemployed person who is willing to work as a slave. A job is a right that citizens should have.

[@codzomz]

Summary: blood is fancy!!

[@xm377Moyocoyatzin]

codzomz Ahhh, my life has meaning again. Thanks. (^_^)

[@misanthropistbookworm]

This was extremely useful! :D Thank you. And yay for Michael!

[@kaen1037]

Where are my AB- squad at?

[@summerlove3978]

Kaen iam ab-

[@treeerickson7143]

Kaen im a-

[@calmguy3672]

Kaen 😀😀

[@kingone3452]

Ab- 😁

[@Ваня199]

👻 I'm AB-😅

[@SpiceCh]

To those wondering: Type O Rhesus negative is the least compatible blood type (it is only compatible with itself), while AB Rhesus positive is the most compatible blood type (it accepts all other types of blood).

[@Zachary-md1ft]

AB positive, I can give to no one but can take any type of blood. I'm a universal plasma donor, though. Guess I'm selfish but selfless...?

[@iloveprivacy8167]

You can still donate, can't you? There are AB's who need blood.

[@Zachary-md1ft]

ILove Privacy Nope. ABs can accept from everything but AB positive. Ironic.

[@iloveprivacy8167]

AB positive can't donate to AB positive??? Or are you saying that the demographic for your blood type is small enough that it's not worth the paperwork? (Plenty of A & B, so no need to save the O for the O's who can't accept anything else.)

[@Zachary-md1ft]

ILove Privacy Nope. AB positive literally can't donate to anyone. AB positive has every possible antigen, which kills any other blood cell that isn't AB positive.

[@markocoric9233]

Luke I am 0-

[@anmrivera6736]

Thank you! You saved me a headache of study time after a loooonnnngggg day at work! 😁👍

[@CoL_Drake]

even more intresting would be WHY do we have different blood types

[@mutantmaster1]

I've read something that said that certain blood types can fight certain diseases better that other types. Type O has better luck fighting staph for example (might not be the specific disease) because these diseases keep popping up, there's a bit of an evolutionary pressure to keep even the "naked" blood types around

[@billvolk4236]

Presumably for the same reason that all keys are different. If the goal is for your immune system to identify your own cells and attack foreign ones, it helps if not all human immune systems identify their own cells in the same way. If there were only one blood type, any disease that could get past one human's immune system could get through them all.

[@nurlindafsihotang49]

+Bill Volk well, kind of species survival strategy?

[@Schatten2712]

that is a good question but currently that is like asking why do we humans exist...I mean, biology can be really fucking weird some... most of the times... and most of those times we just don't know why biology decides to act like that, we just have to deal with it

[@CariBaez]

Holly God knows And He will tell us from some one

[@aejlindvall]

This makes so much more sense now, Thanks! Understood the "why" when I took biology, but no teacher ever brought up the "why".

[@Tomyb15]

But if Im not O and im given O, won't the antibodies in the blood from the donor (O type) attack my red blood cells? Does blood have to go through a special filtering to get rid of antibodies?

[@arwahammuda9780]

+Ciroluiro usually not, because antibodies are formed inside of the recipient body,

[@xboxboy93941]

+Ciroluiro Yes, antibodies are filtered out from the blood. Hence why type O is considered the Universal Donor: they can give their blood to pretty much anybody.

[@BarbieQueen1990]

O+(can donate to A+ B+ AB+) O- can donate to all blood types

[@maakjar]

It would be great to see another video that has more detail on this and the benefits of each one in life

[@Justanotherconsumer]

Fun fact - the difference between O and A red blood cells is... one base pair. O is a nonsense mutation of A. The description of Rh types is abysmally wrong. Rh positive is just the D antigen, as it's usually called. The system also includes c, C, e, E, and a long list of others, but D is the one that causes the most problems clinically. I'm short a few cousins due to e and c, though. There are a lot more antigens than just the ABO system and Rh system, but most are either extremely rare or nearly universal and they don't often matter. Also, that people have anti-A and/or anti-B antibodies without prior exposure is a bit of a mystery.

[@1973Washu]

There are over 600 known rare blood types aside from the common 8 groups which most people fall into. The red cross has a rare blood donor program for these rare individuals.

[@megamegatron99]

so people with type negative o are the *EXACT OPPOSITE* of people with type positive ab

[@stanislasb.6880]

He is clearly working out. Very interesting video subject.

[@BlakeGeometrio]

Any negative blood types here?

[@amandaparker23]

+Blake “Noctis the Cynical” Geometrio im rh -

[@BlakeGeometrio]

Amanda Ferrante Cool! Same.

[@amandaparker23]

+Blake “Noctis the Cynical” Geometrio we have the rarest blood type :) if you're caucasian like me only 1% of people are rh neg!!!

[@BlakeGeometrio]

Amanda Ferrante Awesome. But, I'm mixed. :)

[@nikanna75]

+Amanda Ferrante +Amanda Ferrante yup me too Rh- and an A blood type as well. Caucasian too

[@PappaLitto]

I learned this back in high school and I have to say this was rather fast for someone that didn't know any of it to begin with

[@ze_rubenator]

So if you have 0- you can only receive 0- blood, but you can give blood to anyone? I'm asking because I have 0-, and it seems like blood banks would REALLY like my blood. I'm wondering if I should start donating.

[@cheermaddie]

LegoGirl1990 In other languages/countries, it's often called 0 instead of O.

[@IcewolfBluemoon]

Yes you should definitely go and donate if you can! O- blood can be used by anybody of any blood type. O- is the type of blood that is most desired in blood banking because of that fact. ^__^

[@CherryBomb50]

I'm O- and donating tomorrow :)

[@ecnivlegin]

definitely donate. :)

[@cyanmanta]

If they know you're O-, that may be why they're so interested in getting you to donate.

[@sumayaalharbi6380]

Thank you so much for clarifying the meaning of this wonderful way

[@BernardoSOUSAstudent]

2:45 Thank you for subscribers who keep these ANSWERS coming? Did I miss something or you should have said "questions"?

[@nesagwa]

Subbable subscribers that actually give money to keep the show going. It's at the end of every video.

[@Crzycomic]

CMV Negative O- Reporting in. I urge fellow O- types, as well as anyone to donate on a regular basis. You save peoples lives, that's awesome.

[@GeeksOasis]

When I click the like button it doesn't change color anymore. Does this mean I'm gay? SciShow please help.

[@godzuky9]

Absolutely, now go and give some blood today.

[@_dreamles3945]

Ha gay bitch

[@mksabourinable]

I'd like to know more about the iron in our blood. Like why iron? What does it do? Like our blood is made of cells, which is organic matter, and iron is metal, something that usually seen as inorganic....

[@GringatTheRepugnant]

Iron doesn't exist in our blood as a metal, but as an ion. It's part of the haem group, a little bit of molecular kit that forms the core of the haemoglobin protein that allows red blood cells to carry oxygen. Without iron in the red blood cells, they wouldn't be able to pick up any oxygen. This is why anaemia (a low level of iron in the body) leads to paleness, chronic fatigue and exhaustion. There are a lot of other metal ions used in the body, too. Potassium and Sodium ions transmit signals through the nervous system. Calcium ions cause cells to release hormones and allow muscle cells to contract. In plants, the chlorophyll molecule has a Magnesium ion at its core that allows it to pick up solar energy. There are loads of others, but Iron, Potassium, Sodium, Calcium and Magnesium are the most well understood textbook examples.

[@sammeri6997]

***** nicely explained, well done!

[@mksabourinable]

***** Thank you, that actually really cleared things up, thanks! :)

[@Casanuda]

AB+ Master Race

[@henrystp]

This is a great video and I've always wondered about this!

[@moved6332]

My blood type's B- , being the third rarest of..known blood types There's WAY more than 8 blood types..

[@thefattesthagrid]

+FluffySpaceGoat u feel special now?

[@VidConMom]

Always curious about blood types, bloody fascinating!

[@SaeedNeamati]

While relegion made millions of people die in wars or crucifications, sciense saved life of millions. I respect sciense and scientists.

[@FinalLugiaGuardian]

Amen to that. Science rules.

[@FinalLugiaGuardian]

Nemesis ryu Religion may be used by people, but you have to admit there are some large religions that by their very nature produce more violent groups than others (ie the Abrahamic Religions) and it is these religions, not religions like Jainism, that many have a problem with. Yes, science has been used by men to do evil things. Look a Hitler's death camps. But science has the ability to adapt with new information built in to it. Science is like fire you can use it to cook a meal or to burn down someone's house. On the other hand, many (not all) religions are like a disease. You cannot deny many religions stake their validity on being unchanging for even for the most backward of ideologies like making homosexuality or leaving one's religion illegal and sometimes punishable by death. It is these religions that I believe Saeed Neamati was referring to in his original comment.

[@FinalLugiaGuardian]

Nemesis ryu 1st, it is not just Muslims. It can be any Abrahamic Religion. Look at Uganda (a country with many very devout Christians). While gays are not executed there, they can be imprisoned for life. That is not much better. And 2nd, Muslims are not met with anywhere close to the same animosity by the US government that Religious Minorities, ex Muslim converts, and gays are met with in many Islam majority countries' governments. That is why nobody thinks about it. The two are just not comparable.

[@FinalLugiaGuardian]

Nemesis ryu True, many scientists did once think that certain races were inherently inferior in both mind and body, but science evolved and now there is no longer any support for that idea. Science by its very nature is a work forever in progress. Unlike many (not all) religions which stake their validity on being unchanging for even the most backward practices like killing gays for loving the "wrong" person. It was science that has showed many people that being gay is indeed an immutable trait you are born with and thus there can be no wrong choice committed by gays because they made no choice to start with. It is religious ideas from the Abrahamic religions and those that hold on to them in full that continue to hold back society by trying to apply a standard of morals from 1000s of years ago to an ever growing world of knowledge.

[@FinalLugiaGuardian]

Hardly anybody thinks homosexuality is wrong anymore is because it isn't wrong. there are no other bad effects from gay relationships that heterosexuals do not have. What 2 consenting adults do in their own bedroom is nobody else's concern. Same thing for who wishes to associate with them. As long as gays are not harming anybody else what is wrong with letting them be. And yes gays are likely born the way they are. One cause seems to be something called epigenetics. Epigenetics deal with how our genes get expressed when the body develops (including brain development). Sometimes during development mistakes get made by epigenitics and result in a kid being born gay. And I would not exactly call to gays having consensual sex comparable to things like rape or murder. There is no victim in a gay relationship (provided it is consensual). That is the difference between gays having sex and the the crimes you mention. And on girls wearing short shorts, if you don't like seeing that at your local bar or restaurant look the other way or go to another place with a dress code against that type of dress.

[@christinearmstrong3044]

Thank you, this was very helpful, you made it easy to understand . Great help for homeschool

[@TheEzypzy]

I have O- Fuck

[@gotentk4]

Ezypzy yay you are universal donor

[@dbluewh]

More Michael Aranda please!! personally, I prefer the calmness of Michael over the jumpiness of Hank

[@FirnenOftheages]

Cool I can give blood to anyone O+ FTW.

[@MidorinoNinja501]

+Firnen Oftheages, almost anyone (positives only). I'm O+, too.

[@moved6332]

+Firnen Oftheages I'm B-, so not me. xD

[@mexicanjesus8482]

+VampyArgonian Twinsies

[@user-gu2kd8bi3p]

+[MOVED] I have B- too :P

[@abdullahenaya]

+Uno KillMe O- can give to anyone, while O+ can give to anyone positive only so you can give to anyone!

[@dessfred]

If some people finds it interresting, it's good to know there's many more antigens system on the blood than just ABO and Rh. Before a transfusion, medical labs have to check for either rare antigens group or rare antibodies. Some of them are so uncommon, less than 0.01% of people got them. Search for Duffy, Lewis, MNSs for some more complicated stuff!

[@ex-nerd]

Definitely not quite that straightforward. I have a friend who tests as one of two different blood types (I think A and AB) depending on the sensitivity of the tests used by the lab. It makes donating blood an interesting challenge, though definitely shows that there is at least some kind of sliding scale between things.

[@CalebHughesTheGingerNinja]

Could he be one of those people with two+ different sets of DNA? Whatever the human version of a Chimera is?

[@CalebHughesTheGingerNinja]

citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.149.9001&rep=rep1&type=pdf Found it! Apparently this isnt even all that rare.

[@DanielDeVito89]

Caleb Hughes Really interesting! Thanks!

[@tsssil]

In terms of ABO, it usually *is* that straightforward. Sometimes people type wonkily due to illness or something else weird, but I work in blood banking and usually people are pretty straightforwardly A, AB, B, or O. Granted, once you get into unexpected antibodies and stuff, it can be more complicated

[@RyanMathewHarding]

I would say that this is much the same as saying certain things only happen to one sex. Yes, there are people who fall somewhere in between, but they are all cases where something went wrong in their genes. Either their DNA failed to replicate properly when they were conceived or something is being expressed improperly, but they aren't the normal case. Basically, there's only one way that humans are "supposed" to work. There could be nearly infinite errors in your genes that change how your body works and as such it's impossible to explain all of them. Instead, they just show us how it's "supposed" to work because that's how it works for the vast majority.

[@PinkChucky15]

Thanks for explaining this, I though I knew what blood types were, but apparently I didn't know all of it lol :-)

[@irvin295]

Idk what blood type I am ... althoygh I do want to know.

[@weldin]

Ask your parents. If they don't know, ask both of them what theres are. Then go online and search for a blood type calculator.

[@irvin295]

Cinestar Productions​hmm good idea I haven't thought of that

[@rasangit7239]

you just taught me a whole lesson in 3 minutes god bless

[@topmobslayer]

Who is dis guy???

[@blazebluebass]

Michael Aranda. His cuteness level is over 9000.

[@topmobslayer]

wat

[@wolfafe]

wat

[@jpheitman]

wat

[@leebautwo2657]

wat

[@lilylilylilyz]

i got so excited when michael popped up... made me watch this video tip the end even though i had NO idea what was going on

[@EpicAwesomeWin87]

I'm B Pos, which makes me smile. Be Positive ;D

[@popandkidsdonate4640]

So cool! I've been wanting to know that for so long. Now I understand. Thanks!

[@SAMMIsLIFE]

Im O-positve

[@SAMMIsLIFE]

positive*

[@tiffinit6056]

SAMMIsLIFE most common

[@Shadrio]

That was a nice little video there. I guess that why I always hear that being an O negative really sucks.

[@thisisbecker]

This was a really informative video! I know they all are, of course, but I didn't really know the break down of blood types prior and this and honestly hadn't thought much about it.

[@cassif19]

I don't understand why so many people complain about this guy. I really like the way he speaks

[@blomegoog]

Need a part 2. This episode created more questions than it answered...

[@GeoEstes]

Excellent explanation.

[@JonesNoahT]

This guy enunciates really well.

[@JillH1995]

Thanks for doing this episode, but I kind of wish you would have made it one of your longer, in depth episodes instead of a quick question.