A person walks across a room in barefeet and puts his foot on a drawing pin lying on the floor. He lets out a cry. Explain what happens in his nervous system in bringing about this response.
The action performed by the person is a reflex action. In this example, the foot acts as a receptor and pain act as a stimulus. The person feels the pain in the foot and hence withdraws his foot from the pin. The pain is sensed by the receptors in the skin of the foot which triggers an impulse to sensory neuron and transmits the message to the spinal cord. Here, the impulse is passed on to a relay neuron which, in turn, passes it to a motor neuron. The motor neuron passes the impulse to a muscle in the feet. Then the muscle contracts and pulls the foot away from the drawing pin.
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