Diffusion and osmosis | Membranes and transport | Biology | Khan Academy

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Learn about diffusion, osmosis, and concentration gradients and why these are important to cells.
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[@mcl720]

0:00 solvent review 2:28 diffusion introduction 6:29 diffusion with solutes 8:16 diffusion vocabulary 10:55 diffusion with membrane 17:12 osmosis

[@apollo193]

Thank you so much!!!

[@gaiusmarius4112]

Vielen dank

[@Daevoz]

thx

[@okoyechioma690]

Mitchell Lenneville thanks .....I sometimes don't like how he beats about the bush without going straight to the point

[@alyssamarie3527]

Mitchell Lenneville I love u

[@itsmesebah832]

I've learned more in this 19 minute video than the entire hour with my bio teacher, thanks.

[@nataliev5165]

lmao same

[@vasishthaserrattan3276]

it's me sebah! same here

[@AngelAngel-rg1wd]

same here

[@alisaiem5941]

Exactly

[@demetriotorres1210]

it's me sebah! 2 weeks

[@reef99red]

Lol, "hopefully you found that useful and not totally confusing". Are you kidding? That is the clearest, least-confusing, explanation i could ever imagine.

[@rolandoperez6612]

reef99red EXACTLY

[@callessantana2688]

God bless the Whole Khan Academy and its lecturers/providers. You are making this world a better place. Planting hope into the youth by educating them

[@elfadilfado7259]

true.

[@anycolouryoulike8567]

true.

[@_akxri_]

true.

[@wrkin90044]

They weren't kidding when they said Khan Academy is good at explaining things!

[@johnapplepeed]

?

[@iwannadie1861]

Yep but who

[@BEV_shorts]

Osmosis is the diffusion of water as a solvent from a low concentration of solute to a high sconcentration of solute, through a semi-permeable membrane. thanks sal!

[@toober57]

I just needed your comment. Thank you.

[@mosesjonathan9168]

Thanks for making me Understand the more

[@nvngkhinpang2076]

thank you most for this hehe.

[@iwannadie1861]

Tyyy ❤️👀

[@Fulanito-tf9ee]

Thankss

[@DyslexicIm1]

You learn more from this guy in 18 minutes then what you learn in a week at school. Thanks.

[@rougeassasin5701]

A week? Dude I am learning IGCSE Biology and my teacher "covered" the whole chapter in 45 minutes and I am still confused.

[@mypeaceluv3]

I cant even tell you how much this helped me. My biology teacher does this thing where she zips through the notes in a week and then gives us problems on the test we didnt learn. This makes it so simple for me to understand, breaking it down like this. your amazing, thankyou.

[@maddimaher6367]

Wow I might not actually fail my test tomorrow

[@dora42]

Ha me2

[@esi8285]

i swear,you are the best teach ever! my biology teacher is good,but in these cases where i wasnt in class and i have no idea hor to explain these stuff to myself,youre a life savior. god bless your soul!!!

[@OliviaPlunkett]

My teacher should just show this and save himself the confusion and time of making a lesson. I literally learned more from this short(ish) video than I did from a whole biology unit. This was a great test review too!

[@meganw4375]

This helped me alot.....My biology teacher is a terrible teacher and doesnt know how to explain things!!

[@savagegamerhd1106]

+megan wehlmann same

[@catherinewilliams3213]

Same useless

[@omarspectic]

+megan wehlmann same

[@kiwi-sk3eo]

Ohh mine too ='(( !!!

[@lakiahmed5395]

@@kiwi-sk3eo mehh 3

[@aishwaryajayan7687]

You've got a fun way of explaining things without losing the boudary!!!I have understood topics in a much better way!!!You're the best Sal!!!

[@annmaryabraham7322]

idk why but i just love how colorful the whole thing is, its one of my favourite things about these videos tbh

[@alisakhan96]

i just love the way this person makes a difficult topic simple

[@TheCreativeNick]

7:42 *Balanced, how all things should be.*

[@ajlakameric2684]

honestly, this is one of the rare videos on the channel where everything was overly generalized, and the explanations were not-so-amazing

[@rachelreynolds3326]

I really like him as a teacher. He repeats words when he’s talking.

[@soxpuff]

You introduce concepts WAY better than my teacher. This 19 minute vid was concentrated with clear information and I understood much more than when my teacher spends an hour jumping from concept to concept.

[@cobiobrien3038]

Wow I've been watching videos all day to study for finals. But your videos are by far the most clear and easitest to understand. Thank you so much

[@iwannadie1861]

Wow this comment was 7 years agooo 😂💀👀❤️

[@ifiehill1789]

God bless you. That really helped a lot. My biology teacher was really confusing but you straightened it out.

[@carendavis7426]

Thank you! After hours of textbooks, notes, and lectures, it was majorly confusing. But your nineteen minute video? Completely makes sense now.

[@littlesadlerable]

*mindblown* why can my teacher teach it this simply

[@letsshaketheworld]

You just saved me an hour of studying notes into 20 minutes! I love this!

[@godschild9071]

Omg thank you. You made everything so clear I was not confused at any part of the video gonna ace tht test tomorrow.Thanks :)

[@adrianhutanu6181]

same, this does really help

[@YoungRippa]

yes

[@sirbrucalot]

did you ace it

[@faisalahmadshaikh9499]

@@sirbrucalot aren't u 6 years late?

[@ilovebiriyani101]

I take Bio in 8th grade so it makes things harder to take it earlier. What makes it worst is that our teacher CANNOT TEACH. Instead of showing examples, all we do is take notes. After watching this video it enhanced my knowledge of diffusion and osmosis. Its SOO much easier now and less complicated. If I had Sal as my teacher my life would've been SO MUCH EASIER.

[@iwannadie1861]

Wow this comment was 8 years ago...wooo

[@ilovebiriyani101]

@@iwannadie1861 I'm in college now and nothing has changed since this comment loool

[@Sapphiirex]

Very clear and straight forward; thank you so much! I finally have a clearer understanding of this topic for school.

[@reynahdz9647]

Wow great vid! why can't all teacher be like this guy???? =(

[@AJJUCAS]

He is.

[@pinkcherryblossomful]

we spent a week trying to learn this and my i didnt understand.... now i just learned it in less than 20 minutes. how about i just drop out of school and just watch khans videos all day?

[@ouiemfrs4373]

I love it when he just calls a molécule 'this guy' ")

[@MelTee38]

Your video helped me soooo much to finally understand diffusion and Osmosis!! I'm studying for my CCHT test and these are the related questions I had the hardest time with.....until you explained it in a way I could understand. Thank you so much!!!

[@aodhanlynch9462]

Yay an adult who has took a biology degree and can teach unlike my biology teacher who relies on textbooks and the internet

[@R4ZOR_BL4DE]

this has to be the most clear explanation of diffusion in my life.

[@ProfessorPeasant]

In the first 4 minutes alone, you taught me more than my teacher could manage in a week. Exceptional, subscribed :)

[@maureenmccormack5989]

I have a test on cells, heredity(etc)tomorrow couldnt remover anything about this. Super helpful. You explained ThisWAY better than my science teacher ever could

[@Priyanka-ir2tb]

where ontario teachers have failed to teach students properly, you have come in and done their job, so thankyou!

[@heyandreww]

this helped me out a lot! Thank you for taking the time to thoroughly explaining Diffusion and Osmosis! I didn't understand my professor at first but I got it after watching this video. Two Thumbs Up!

[@brittani.alyssa]

I have been reading about semi permeability, diffusion, and osmosis for nearly two weeks now. I felt like all my resources were giving me conflicting responses. I get it now!!!!!!!!!! :)

[@emptypockets413]

i really like the way you break down the subject matter for non-bio nerds. sending a big thank you to you!

[@leezmarie22]

I absolutely love your videos! After reading text book information and struggling to retain it, your videos have helped seal it into my brain and pretty much saved me (the exam will prove my theory anyway!!! Cheers!

[@DestinyWilson001]

NOW I understand when my teacher mr.hans does it I don't under stand

[@netanel296]

I always found osmosis really hard to understand but you made it a bit more clear to me, thanks.

[@Nicasweets23]

THANK GOD for Khan Academy, I have a biology test coming up and was so lost. I watched this video and it makes sense, keep doing your thing, Saul!

[@herbpixie]

Thank you! Doing an anatomy and physiology experiment on osmosis and diffusion tomorrow, and I now have a much better understanding of the principles behind it.

[@superladybree1432]

Thanks so much I have been in class 5 weeks now and I have learned a lot but; diffusion and osmosis kept going over my head but with your help I GOT IT ! God Bless you !

[@MCzoom1357]

i have been very sick for almost two weeks, and the day i get back I have to take a test on this. My class has been going over it for two weeks, so I had to learn it all in one day. I watched this video and got an A on the test, while everyone else got a b-c on it. Thank you so much.

[@DracoonTheDarksigner]

How does he learn EVERY SINGLE subject that I need help with? He always has exactly the subject that I need.

[@vpcreationsunlimited]

HI Sal, I've been watching your videos since your started and now still watching....I love your channel and I am learning so much for Anatomy and Physiology than listening to a boring lecture for 3 hours !!

[@hellokittyx958]

After watching this, I got 90% on Osmosis and Diffusion test. Thank you!!!! Credit definitely goes to khanacademy!

[@kennethbarrancas5068]

the Khan Academy guy know everything💯

[@vanessaescalera4117]

wow that was a whole lecture in 18 minutes. amazing. this is why i donate lol. AMAZING!!!!!!!!!!!!!!!!!!

[@whatrtheodds]

I'm studing at home and was ment to go on a break, but i was actully enjoying your teaching style so much i watched into my break, so clear, thankyou so much!!!! You rock.

[@SyedHousein]

Just looked this over for my first quiz in Anatomy and Physiology 2. Thank you for this explanation!

[@yatogami2919]

Doctor Syed same but for A and P 1

[@SamiaNutritionistphsiotherpist]

This is the kind of video that really deserves a like, subscribe and a comment not that cringe videos I HOPE I PASS I HAVE A PAPER TODAY ACTUALLY WISH ME GOOD LUCK 👍 🙂 🙃 😩 😪

[@SamiaNutritionistphsiotherpist]

What even is this guys name, such a legend

[@Bernadettefull]

A little long winded but I like the repetition - makes good for test prep. You have a nice voice too which makes it easier to keep listening. Thank you.

[@YesForNo]

The thing is that english is not my language and I clearly understand what he's saying. I just listened all proces of photosynthesis and I feel illuminated about it.. Now I'll explain it to my teacher :D

[@Mafieldgirl13]

Thank you so much! I don't comment on videos but I have to thank you. My biology teacher this year makes no sense! please don't ever stop making videos.

[@JAMiSHNeSS868]

what you are doing is amazing ! I personally appreciate that you take your time to explain this ! I hope you love what you do.

[@kirztenabbyo.bautista5615]

Thanks for clearing my confusion about this topic. You made it easy to understand, thank you Sal!

[@XxsuperstudlyxX]

I thank you so much for going into detail as to why all this stuff happens, my brain won't just accept that something just happens and that's the way my teacher explains it, but you take more time to explain why it happens, why diffusion occurs the way it does and it helps me a lot and helps me comprehend it better :) thank you

[@LofiwithShamique]

this is the first time ive been able to understand this topic!!!! THANK YOU

[@Gucci19zoo]

that's the best lesson i've ever seen in my life, with colors and clear explanation smooth voice wow wow wow c'est vraiment le top du top

[@Jsuriano]

OMG you're so easy to understand, I so totally subscribed to you, I'm a visual learner and this right here is perfect, I love it because you explain it in its simplest form.

[@pinksplodge886]

This is a brilliant video. Loved the black background- found it helped with focusing on your diagrams. Many thanks!

[@MrMcBruisycheeks]

Thank you, this really helped. I liked how you explained exactly why the solute goes from high concentration to low concentration until equilibrium is reached. I never understood that part. The illustration that was particularly helpful to me was the one of sugar molecules blocking the openings in the membranes.

[@belligerentbeagle]

Oh thank you!!! You helped me so much..... Have been sick and missing classes but now I can catch up!

[@Khaledhisham]

GOD I WISH YOU WERE MY BIOLOGY TEACHER !!! I LOVED IT THANK YOU ! i dont know how to thank you really keep on uploading videos !!! THANK YOU !!!

[@baileyedwards4530]

gazillions is the technical term

[@cochran3369]

this was awesom! so helpful! i was all upset bc ur teacher required us 2 watch this but it was acually helpful!!!!!!! THNX!

[@david1401170]

gosh this guy explains everything with such ease and simplicity. its awesome

[@imtiyazhussain8873]

The video was 19 minutes long and I didn't even realise. But thanks, this was so useful. Love the colours too.

[@richardhobson197]

Brilliant Video!! Really clear to understand.

[@Msalazar20100]

u make everything make sense.. i bet if i watch all of your videos i would ace my bio class

[@100sunbeams]

Thank you!! I'm reviewing for my midterm next week and going through my notes and reading the textbook was quite a confusing process. Your videos are clear and very helpful. :)

[@AnEscapedMind]

Excellent video. You teach on the level of genius because your vision is high enough to fully understand the topic and you are able to downgrade, or lower, or descend into the thoughts (previous visions) that created your highest vision.

[@cmac6551]

This helped immensely. flunked my last test on this but retaking it soon. Im sure this helped!

[@Talafenon]

Very nicely done, my 5th grader now understands Osmosis and Diffusion. This is much better than I could have done and he is now excited to do his science project for school.

[@Fin-the-frog]

I have a bio test tomorrow. Thank you so much, this feels more clearer now 🙏🙏

[@IshrakAnjum]

I have a test tomorrow on this topic and this video really helped me understand what osmosis and diffusion is. It actually helped me by looking at the drawings . I also found it interesting. :-)

[@estebangutierrez4316]

me too

[@IshrakAnjum]

ok, hope you all did very well :)

[@estebangutierrez4316]

thanks!

[@theartofmoving9057]

Love this one, very simple and easier to understand!

[@Kcrossman6]

im a year 9 (form 3) in New Zealand, Mount Maunganui College and I just wanna say thanks. that was reaaaally handy, it will help me loads in my exams.

[@republicbmc7966]

Million times better explanation than my boring IGCSE text book!

[@nicolepowers5935]

I have read this several times in my A&P book and saw several videos and did not understand.. This video totally makes sense. THANK YOU!! : ))

[@angelaloureiro6318]

Thank you so much:))))) I have a test tomorrow and now this finally makes sense

[@maddiefossitt1207]

I have quiz on this topic on Wednesday for my high school bio class and this really cleared up my confusion. Thanks!

[@07yherash]

my highly paid teacher made this sound so complicated and you make it so simple and understandable ... please be my teacher

[@kailashjagessar8906]

i was about to drop my bio class, everything seemed so difficult, then i stumbled upon this wonderful video, and i have so much more confidence. THANK YOU SO MUCH!!

[@debaixodocobertor]

Oh my God I have a bio test tomorrow and I was freaking out because I couldn't understand osmosis and diffusion. This was one of the best classes I've ever had, thank you so much!!!!

[@White0Rose0]

this guy has taught me more through sciences than ive learnt in 4 years studying them!

[@arnavvishwakarma7734]

Thanks for the help!

[@audreykim9975]

I understand osmosis now. Thank you very much!

[@heylaura1]

Thank you, Khan! I can always rely on you to help me with science! You explain it thoroughly, but in an easy to understand manner. Thanks! :)

[@EuphoricFrenzy]

wow all of a sudden everything makes more sense. thanks khan academy!

[@carolinevigna6311]

this dude has saved my grade so many times

[@MiaLilly]

It is not confusing but very helpful :D Thanks so much..This is probably the first time I understand what Osmosis or Diffusion is! ..I didn't understand anything what my teacher tried to explain me :)

[@beastmaster69420]

Watched it again and again,so useful.Thank you so so much Sal!

[@rolandoperez6612]

I love you. I watched this 45 min before taking my bio quiz. Please keep doing this. Is there anyway I can support? This is free and I learn more from you than I do in College.

[@prettyreckless2700]

i study english at uni so nothing scince related however i love learning about science in my spare time and these colourful videos are awesome for that so thanks a lot!

[@PatyBeloto]

That is a great video. Thank you very much. I really enjoy watching this type of content and your examples were pretty clear and effective.

[@shai2905]

superb awesome vid. explains osmosis in clear terms!