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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. - Science

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.

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It is an example of a reflex action. The stimulus in this example is pain which is felt by the foot on touching the drawing pin. This pain is sensed by a receptor in the foot. The receptor triggers an impulse to a sensory neuron which 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 foot. The muscle, then, contracts and pulls the foot away from the drawing pin.   

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Lakhmir Singh Class 10 Biology (Science)
Chapter 2 Control and Coordination
Q 45 | Page 116
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