Human Body (systems)
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This is the ability to see objects, including the ability to perceive colour, brightness, depth.
sight
What is the PUPIL of the eye and how does it work?
the black circle at the centre of the iris which lets light enter the eye. It gets wider in the dark and narrower in the light
How does the AUDITORY SYSTEM work?
sound in the form of vibrations are detected by the ear and converted to nerve impulses that are perceived by the brain
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