GCSE Biology - How the Eye Works (Part 1) - Structure of the Eye & Iris Reflex  #71

GCSE Biology – How the Eye Works (Part 1) – Structure of the Eye & Iris Reflex #71



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 Biology Playlist:

GCSE Physics Playlist:

45 thoughts on “GCSE Biology – How the Eye Works (Part 1) – Structure of the Eye & Iris Reflex #71

  1. 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

  2. If you’d like to practise what's covered in this video, check out the lesson on the Cognito platform – https://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

  3. 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?

  4. 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!!

  5. 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

  6. Hi, I wanna ask, when we are asleep or our eyes are closed our eyes dilate or not. Because no-matter how much they dilate its not gonna get them anywhere. Hoping You reply

  7. 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?

  8. 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.

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