The eye

Human nervous system
Receptor - is stimulated, we have receptors sensitive to sight, touch and sound.

Coordinator - information from the receptor is carried to the central nervous system (brain, spinal cord) which determines what response must be made.

Effector - produces the response

The eye

• ciliary body: contracts or relaxes to alter shape of the lens
• cornea: transparent cover that does most light refractions
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