O-LevelBiologyCoordination & Response5090/12 · May/June 2023 · Q241 Mark
A person blinks when an insect flies into their eye. What explains this reflex action?
Amuscles in the eyelid cause the eye to blink → impulses are sent down the motor neurones → relay neurones → sensory neurones → receptor cells in the cornea detect the insect
Bmuscles in the eyelid cause the eye to blink → impulses are sent down the sensory neurones → relay neurones → motor neurones → receptor cells in the retina detect the insect
Creceptor cells in the retina detect the insect → impulses are sent down the relay neurones → sensory neurones → motor neurones → muscles in the eyelid cause the eye to blink
Dreceptor cells in the cornea detect the insect → impulses are sent down sensory neurones → relay neurones → motor neurones → muscles in the eyelid cause the eye to blink
✓ Correct answer
D: receptor cells in the cornea detect the insect → impulses are sent down sensory neurones → relay neurones → motor neurones → muscles in the eyelid cause the eye to blink
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