BRAINCAKEReflex Responses
A reflex is a rapid, automatic (involuntary) response to a stimulus. The response is the same each time and does not need conscious thought. Reflexes protect the body from harm, for example pulling a hand away from a hot object, blinking when something touches the cornea, or the pupil narrowing in bright light.
The pathway of neurones in a reflex is the reflex arc:
stimulus → receptor → sensory neurone → relay neurone (in CNS) → motor neurone → effector → response
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All 38 lessons in Mammalian Nervous System · All Edexcel A-level Biology topics