GCSE Biology - How the Eye Works (Part 1) - Structure of the Eye & Iris Reflex #31

This video covers
The structure (anatomy) of the eye
How the iris reflex works and allows us to respond to changes in light intensity
Exam board specific info:
AQA - Only triple/separate science
IGCSE Edexcel - Appropriate for all courses
Edexcel - Only triple/separate science
OCR 21st Century - Only triple/separate science
OCR Gateway - Only triple/separate science. Also don't need to know the iris reflex in response to light intensity, so only the first part about structure
GCSE Chemistry playlist:
• GCSE Chemistry - Atoms...
GCSE Biology Playlist:
• Video
GCSE Physics Playlist:
• Video

[@8mycereal]

You are the best channel for GCSE and IGCSE Sciences and Math. I cannot type out enough words to describe how useful your content has been. God bless your soul. You are an angel

[@Cognitoedu]

Thank you so much 😊

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please become my teacher i am understanding my syllabus because of you you don't know how much i am grateful for this continue making this kind of amazing videos!!

[@Cognitoedu]

Thanks Khushi, we're glad you're finding them helpful 😊

[@gaiacooper5]

Hey, this is awesome! I found this really helpful for my biology revision for my test next week. My teacher reccommended you to my class. Short, sweet and quick

[@Cognitoedu]

Thanks Gaia, glad it was helpful 😊

[@way2saturn]

Yea Short,Sweet,Quick

[@4games132]

i don't understand what my teachers explain in school so i rely on u but u never let em down thx

[@TS-rb6pn]

You explain it so much easier omg I wish I wrote notes from you

[@drycereal-c6f]

This was so helpful, I have a bio exam tmr and this helped me revise so much, thank u daddy

[@gilesstockman4913]

really helping have got my biology exam this morning!

[@polishfarmer6656]

Thank you so much for your videos. Sadly, a lot of my teachers skip and rush content, but thanks to this channel I am able to easily learn it :) I hope you know that you help many students with their GCSEs

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My friend u are the GOAT of IGCSE science

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[@nakshahuja9879]

Wow the way you taught this concept was so much better yhen my teacher 😊if you were my teacher i would be trully blessed

[@kubahabet6155]

WOW!! I can't wait for part 2 because this is really useful!

[@Cognitoedu]

Thanks Kuba! Not long now 🙌

[@avymar7167]

I'm two years late but this really does sound like you were held at gunpoint

[@mahnoor4584]

@@avymar7167 PLS-

[@umarrana4857]

shush

[@abdikaadirnasir]

​@@umarrana4857 u having a test

[@samelliott3855]

Got my bio exam tomorrow and i am so cooked, what a fod subject!

[@light2277]

Bro same 💀

[@No.hablo.espanol]

gl for tomorrow asw if u take triple, lucky the eye wasn't in paper 1 (for igcse)

[@abiramims6920]

you give hand in revising my portions for my exams in a sweet,short and in a crisp way. love all ur videos. love from India❤❤❤

[@Cognitoedu]

Perfect, glad we could help you out Abirami 👍

[@nicolemusic2242]

This video was really helpful! It got me thinking about treating colour-blindness: could scientists treat it by inserting cone cells into the (colour-blind) patient’s eye?

[@gaiacooper5]

I don't think so. I have a friend who is colour blind, they can see certain colours, but not all.

[@erxinyiq4649]

it’s probably more of an inability to see certain wavelengths (?) -> since colours are made up of wavelengths on the electromagnetic spectrum

[@faithigbinsosarumen6662]

Thanks for you teaching, you've made it simpler for me than my teacher👏👏

[@kayslife8076]

when in bright light, the pupil constricts to reduce light entering the eye this can be done when the radial muscles relax and the circular muscles contract when in dim light, the pupil dilates to allow more light to enter the eye, this can be done when the circular muscles relax and the radial muscles contract

[@Cognitoedu]

If you’d like to practise what's covered in this video, check out the lesson on the Cognito platform - cognitoedu.org/coursesubtopic/b2-gcse-aqa-h-t_4.13. The platform’s totally free, and has been built to make learning and revision as easy as possible. The main features are: - Lessons organised by topic, only the lessons relevant to your specific exam board and tier are shown. - Automatic progress tracking. Progress bars tell you what you’re doing well at, and what you need to spend some time on. - Practise quizzes so you can test your knowledge. You can quiz yourself on any combination of topics you like. - A huge number of fully-hinted questions that take you step-by-step through some of the trickiest calculations & concepts. - A comprehensive bank of past exam papers, organised both by year, and also by topic. Amadeus & Tom

[@سوسنالعمري-ذ6ث]

Tysm this rlly helped for revision

[@maiaschwarb5456]

Hi triple science class 👀

[@fzaithful]

whos revising for paper 2 tomorrow? 😒

[@velocityyy1244]

me amigo

[@fzaithful]

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Me but its a mock lol

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P4 bro:')

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Yo, whos here for there biology lesson

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Aren't we supposed to?

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I don't know if anyone fell for that 😂😂 but @Oscar Moises and @Augustine Pablo are duo scammer. I've seen them in other places too XD

[@dania-c1y]

im 1 yyea r late but i have a presentation about this tomorrow 😢

[@Chopperrr]

@@dania-c1y good work

[@aisanjamalpoor8333]

U teached better than teacher.

[@aimenfatima6326]

Could you please make a video on coordination?

[@ftb27677]

Great video! Really helpful for my biology test! Thanks!

[@potatom2765]

Thanks my image i had to study overwhelmed me

[@garykillen3130]

thankyou so much for this video! really well explained! it makes so much more sense now !

[@Cognitoedu]

Great to hear - thanks Gary!

[@kinglynessofficial5099]

your videos have been very useful to me thank you very much and plus they are free,first time i heard about them it seemed like i had to pay to view them but nope🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥

[@kayslife8076]

dim light - pupil dilate- radial muscles contract- circular muscles relax bright light - pupil constrict - circular muscles contract- radial muscles relax

[@ada9994]

In this playlist for GSCE biology what content do you miss out on? Because it mentions that you covered the majority of content. Thank you so much.

[@theslowmo1444]

Fact to impress your examiner: the point on the retina that the light focuses on is called the fovea (centralis)

[@kushkundalia2926]

It says about the pupil reflex in the syllabus.... Is the iris relfex and the pupil reflex the same thing?

[@hamzaelattar9135]

Have a great day everyone!

[@paracesis3209]

ok nice comment but what does this have to do with the vedio its self

[@aliyarazack8536]

Same to you🥺😌

[@24_4L_gang]

I have a question- when you need to see objects at a distance, what happens to the lens??

[@PrincessGiselle_333]

Thank you so much for this wonderful video, it was very helpful! Why I cannot even believe how much I just learned from you in just under 5 minutes 😃😂😁

[@Dean-i3g]

Is this gcse triple science biology??

[@light2277]

Got biology tomorrow wish me luvk

[@Antonio-jx8ww]

You are a life saver

[@sushmii11]

this was insanely helpful, thanks!!

[@txmjid2372]

GCSE today thanks cognitio

[@ahmediftekhar345]

Would u mind doing a video on Aerobic Respiration?

[@rangineechoudhury3755]

The structure of the eye was not explained properly. The part explaining iris reflex was clear and well explained.

[@Cognitoedu]

Hi there, would you mind elaborating on which part of the structure wasn't explained properly (so that we can fix it)?

[@rangineechoudhury3755]

@@Cognitoedu Often questions are asked about the structure and function of the three layers of eye - sclera, choroid and retina. This part was not explained properly. May be a separate video explaining the different layers and parts of the eye is required.

[@Cognitoedu]

Thank you @@rangineechoudhury3755 Can I ask which exam board it is you do?

[@rangineechoudhury3755]

@@Cognitoedu IGCSE

[@Cognitoedu]

IGCSE Edexcel or IGCSE Cambridge (CIE) is that sorry?

[@g27]

Since they cornea absorbs oxygen only by diffusion directly from the air, then if a person sleeps and closes his/her eyelid, the cells in the cornea wouldn't respire any way right? And consider if a person sleeps for a long time, say 10 hours. Does that have an effect on the cells of the cornea and its job in the eye?

[@ss-hc7tb]

i dont think thats how it works. humans dont absorb oxygen from diffusion lmao, its from breathing

[@g27]

@@ss-hc7tb Look it up. I believe that the cornea is the only tissue that gets oxygen directly from air. If blood were to flow through it, the cornea would be red since blood itself isn't transparent, and the red veins in the eye when having tiresome eyes seems very obvious and clear the eye is redish that time.

[@whyyoulooking4944]

Does damaging the cornea damages my eye sight?

[@samsart4890]

Yes pritty much

[@nerd_yboi8771]

Thank you! :D

[@al-azizashow1425]

Please make a video on support movement and locomotion

[@Apex_lifestyle]

You didn't talk about circally muscle and sercally legament

[@mahambadar8354]

Very useful page i am impressed very very very Nice Best Of Luck and Thank You for these intense and useful information not less than a Good and inspiring lecture.

[@lainaameya858]

Video was helpful... please create more videos🤩

[@wg8375]

4:00 very well explained sir

[@sfrdwsy41]

when you are going to put more videos !!!!!!!!!!!! i need videos for 11 grade please without you i whould not pass

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i love yall so much, thank you

[@dee5237]

Y’all who’s here preparing for their igs

[@mysticwillows8233]

What exam board is this for?

[@akioustanley9455]

Can this be downloaded and used for other students

[@bubu97ish]

I thought you were doing physics so are you going back to biology or is this higher than gcse

[@Cognitoedu]

Hey, we’re now releasing alternating videos for each subject as we’ve done the bulk of each one. The videos coming out now are mostly the triple science material for each subject 🙌

[@bluemacaroons]

U are an absolute life saver thank u so much!

[@slowe0284]

What exam board do you teach

[@zebamaryam]

Really good explanation!!! Just subbed to your channel!

[@inupinu9209]

thank u

[@alanlai9636]

I see. How very intereyesting

[@tezawr3963]

Thanks

[@molly3276]

anyone playing this just so your teacher doesn't think you're listening to music

[@dude_mude3366]

not rlly , but i think imma snitch about u to the teacher for doing that : )

[@abdikaadirnasir]

Only u😊

[@oldf6lo499]

Doing it rn💀

[@Blackberry-m4r]

Lol me 2

[@Cinnamon_Gurly07]

No

[@altritzy8550]

Trying to remember which muscles contract and which muscles relax is so confusing

[@suvarnikaradhakrishnan1247]

it's always the opposite when u think it contracts it relaxes and when u think it relaxes it contracts just like biceps and triceps. :)

[@sh3llie]

@@suvarnikaradhakrishnan1247 that’s what I was thinking

[@Insightful_Choice]

what is the function of the retina

[@willowinnit1169]

I think it helps you focus when the light retracts and hits it.

[@lauraviner1348]

It’s the light-sensitive lining of the eye: it’s part of the nervous system. Pain nerves sense pain, temperature nerves sense hot and cold, and retinal photoreceptors sense light and send it to the visual part of the brain to produce the experience we call sight

[@yusuftopia4391]

thank you

[@Jiakhirodhur777]

I will let you know how I did on my test

[@Jiakhirodhur777]

I think I did pretty good but I don't think I'm getting my results cause schools are closed for the 3rd time due to covid

[@mudassirshiraazi2941]

It really helped me thanks ❤️❤️

[@severussnape6157]

How interesting…..

[@MariaVatilifa-jl9lx]

Pls sum things up at the end of your videos. Thank you.

[@Mohammadaljazazi]

ok but how do we use goggles if the eyes gets oxygen by it’s self and how do we sleep with out breathing from are eyed

[@AnasitoruizFeliciano-uu3dm]

❤my eye seen something too seen even to the dark sign up the heaven above,why?stoney is a one eye,one heart.

[@gamer_ksa9517]

Commented

[@The-advicer]

❤❤❤❤

[@LuckyTakkallapalli]

im the 135th comment!!!

[@zoes8785]

algorithm

[@kriston-rosshogan9926]

did anyone else's eyes feel weird watching this? XD

[@sabasani9148]

i have a phobia of too mny eyes! The pictue at the start is too much!!

[@thiccasfwazowski]

Womp womp

[@Cinnamon_Gurly07]

Um? We dont gaf

[@roymrnocap8080]

Education is not eazzzzzzy

[@idkhshshgjs]

my teacher gave me this 0-0

[@kaladharyadhav7697]

This is Indian and you

[@wg8375]

🤣 I think they mean "I am Indian, what about you?"

[@paracesis3209]

Hold up what did he sayyyyyyyyyyyyyyyyyyyyyy?????//

[@AnasitoruizFeliciano-uu3dm]

❤high majesty ,accept my poor opinion to the eye,the is united to the brain and heart. Sense of feeling and taste and touch or etc.the is a magic sense,many hide on this? Even they pick up to the camera or to the cctv camera or etc. To erase it and gone! the@ EYE@

[@prabaljiths5310]

hi guys u might know me lolz

[@Cinnamon_Gurly07]

We dont😊

[@fahadmoha2247]

👎🏻

[@paracesis3209]

teacher: tells me to watch the vedio me: dislikes the vedio me:😈

[@suvarnikaradhakrishnan1247]

vedio ----> video

[@suvarnikaradhakrishnan1247]

no beef just tryna help lmao :p