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

Рет қаралды 356,672

4 жыл бұрын

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

Пікірлер: 135

@8mycereal 2 жыл бұрын

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 2 жыл бұрын

Thank you so much 😊

@fzaithful Жыл бұрын

whos revising for paper 2 tomorrow? 😒

@velocityyy1244 Жыл бұрын

me amigo

@fzaithful Жыл бұрын

@@velocityyy1244 get me out of here

@Lonleybee8 Жыл бұрын

Meee 😢😢😢

@itskaitlyna 3 ай бұрын

Me but its a mock lol

@Khushi-qo6qx 3 жыл бұрын

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 3 жыл бұрын

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

@kubahabet6155 4 жыл бұрын

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

@Cognitoedu 4 жыл бұрын

Thanks Kuba! Not long now 🙌

@avymar7167 2 жыл бұрын

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

@mahnoor4584 2 жыл бұрын

@@avymar7167 PLS-

@umarrana4857 Жыл бұрын

shush

@abdikaadirnasir Жыл бұрын

@@umarrana4857 u having a test

@gaiacooper5 3 жыл бұрын

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 3 жыл бұрын

Thanks Gaia, glad it was helpful 😊

@way2saturn 4 ай бұрын

Yea Short,Sweet,Quick

@samelliott3855 Ай бұрын

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

@light2277 Ай бұрын

Bro same 💀

@No.hablo.espanol 26 күн бұрын

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

@TS-rb6pn Жыл бұрын

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

@charlottebevan1707 Жыл бұрын

Who’s watching day before biology gcse

@ftb27677 Жыл бұрын

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

@gilesstockman4913 Жыл бұрын

really helping have got my biology exam this morning!

@meronadmassu5987 Ай бұрын

My friend u are the GOAT of IGCSE science

@faithigbinsosarumen6662 Жыл бұрын

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

@sushmii11 Жыл бұрын

this was insanely helpful, thanks!!

@PrincessGiselle_333 Жыл бұрын

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 😃😂😁

@abiramims6920 2 жыл бұрын

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 2 жыл бұрын

Perfect, glad we could help you out Abirami 👍

@revisioncentral5383 4 жыл бұрын

Yo, whos here for there biology lesson

@lordespion8789 3 жыл бұрын

Aren't we supposed to?

@lordespion8789 3 жыл бұрын

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

@user-kn8hb6vn9p 2 жыл бұрын

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

@Chopperrr 2 жыл бұрын

@@user-kn8hb6vn9p good work

@mahambadar8354 3 жыл бұрын

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.

@garykillen3130 4 жыл бұрын

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

@Cognitoedu 4 жыл бұрын

Great to hear - thanks Gary!

@nakshahujabhajan9879 11 ай бұрын

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

@zebamaryam 3 жыл бұрын

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

@manasimalhotra9567 7 ай бұрын

I ABSOLUTELY LOVE YOUR VIDEOS AND YOUR WEBSITE

@kinglynessofficial5099 8 ай бұрын

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🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥

@nicolemusic2242 3 жыл бұрын

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 3 жыл бұрын

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

@erxinyiq4649 Жыл бұрын

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

@nerd_yboi8771 4 жыл бұрын

Thank you! :D

@bluemacaroons 3 жыл бұрын

U are an absolute life saver thank u so much!

@freedomfarter2037 3 жыл бұрын

i love yall so much, thank you

@maiaschwarb5456 3 жыл бұрын

Hi triple science class 👀

@ada9994 3 ай бұрын

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.

@lainaameya858 2 жыл бұрын

Video was helpful... please create more videos🤩

@potatom2765 Ай бұрын

Thanks my image i had to study overwhelmed me

@Cognitoedu 2 жыл бұрын

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

@user-nn1yt7ml1q 5 ай бұрын

Tysm this rlly helped for revision

@ahmediftekhar345 4 жыл бұрын

Would u mind doing a video on Aerobic Respiration?

@aimenfatima6326 8 ай бұрын

Could you please make a video on coordination?

@al-azizashow1425 2 жыл бұрын

Please make a video on support movement and locomotion

@txmjid2372 2 жыл бұрын

GCSE today thanks cognitio

@inupinu9209 24 күн бұрын

thank u

@kayslife8076 4 ай бұрын

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

@kushkundalia2926 Жыл бұрын

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

@4games132 Ай бұрын

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

@getrickrolled4395 2 ай бұрын

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

@aisanjamalpoor8333 Жыл бұрын

U teached better than teacher.

@theslowmo1444 Жыл бұрын

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

@hamzaelattar9135 3 жыл бұрын

Have a great day everyone!

@paracesis3209 3 жыл бұрын

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

@aliyarazack8536 3 жыл бұрын

Same to you🥺😌

@light2277 Ай бұрын

Got biology tomorrow wish me luvk

@yusuftopia4391 2 жыл бұрын

thank you

@dee5237 2 жыл бұрын

Y’all who’s here preparing for their igs

@tezawr3963 2 жыл бұрын

Thanks

@mudassirshiraazi2941 3 жыл бұрын

It really helped me thanks ❤️❤️

@bubu97ish 4 жыл бұрын

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

@Cognitoedu 4 жыл бұрын

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 🙌

@g27 2 жыл бұрын

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 2 жыл бұрын

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

@g27 2 жыл бұрын

@@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.

@akioustanley9455 3 жыл бұрын

Can this be downloaded and used for other students

@sfrdwsy41 3 ай бұрын

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

@sfrdwsy41 3 ай бұрын

i really love you

@Apex_lifestyle Жыл бұрын

You didn't talk about circally muscle and sercally legament

@rangineechoudhury3755 3 жыл бұрын

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

@Cognitoedu 3 жыл бұрын

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

@rangineechoudhury3755 3 жыл бұрын

@@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 3 жыл бұрын

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

@rangineechoudhury3755 3 жыл бұрын

@@Cognitoedu IGCSE

@Cognitoedu 3 жыл бұрын

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

@slowe0284 Жыл бұрын

What exam board do you teach

@whyyoulooking4944 3 жыл бұрын

Does damaging the cornea damages my eye sight?

@samsart4890 4 ай бұрын

Yes pritty much

@wg8375 3 жыл бұрын

4:00 very well explained sir

@mysticwillows8233 Жыл бұрын

What exam board is this for?

@kayslife8076 4 ай бұрын

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

@alanlai9636 Жыл бұрын

I see. How very intereyesting

@severussnape6157 2 жыл бұрын

How interesting…..

@molly3276 3 жыл бұрын

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

@dude_mude3366 3 жыл бұрын

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

@abdikaadirnasir Жыл бұрын

Only u😊

@oldf6lo499 5 ай бұрын

Doing it rn💀

@user-lo1gx1gd7w 4 ай бұрын

Lol me 2

@Insightful_Choice 4 жыл бұрын

what is the function of the retina

@willowinnit1169 2 жыл бұрын

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

@lauraviner1348 5 ай бұрын

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

@altritzy8550 2 жыл бұрын

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

@suvarnikaradhakrishnan1247 2 жыл бұрын

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 2 жыл бұрын

@@suvarnikaradhakrishnan1247 that’s what I was thinking

@gamer_ksa9517 2 жыл бұрын

Commented

@itchywatermelon8884 2 жыл бұрын

I will let you know how I did on my test

@itchywatermelon8884 2 жыл бұрын

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

@user-ct2bn7md5x 17 күн бұрын

im the 135th comment!!!

@AnasitoruizFeliciano-uu3dm 8 ай бұрын

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

@SyaafiAbuSyahmi 19 күн бұрын

Eyes.

@AnasitoruizFeliciano-uu3dm 8 ай бұрын

❤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@