A person is stung on the hand by an insect and automatically withdraws their hand rapidly. (a) Describe the part played by the nervous system in this action.
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A withdrawal reflex can occur when you accidentally touch something and withdraw your hand.
1) Receptor cells in the skin detect a stimulus.
2) Sensory neurone sends impulses to relay neurone in the spinal cord.
3) The relay neurone connects to the motor neurone (and also sends a message to the brain).
4) Motor neurone sends impulses to effector.
5) Effector produces a response (muscle contracts to move hand away).
Explanation:
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