A person is stung on the hand by an insect and automatically withdraws their hand rapidly. (a) Describe the part played by the ner

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1. Answer:

   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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