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 Biology Playlist:

GCSE Physics Playlist:

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[kubahabet]

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

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really helping have got my biology exam this morning!

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[garykillen]

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

[kayslife]

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

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