What will you do if someone pricks yourhand with a needle? Elucidate the pathway of response with a neat labelled diagram.

Explanation

If some one pricks our hand with a needle,we will immediately pull our hand to protect ourselves.This is an example of a reflec action.
Reflex action:A reflex is any response that occurs automatically without consciousness.Most of the reflex actions are monitored and controlled by the spinal cord.HEnce they are also known as spinal reflexes.

Reflex arc:The pathway taken by nereve impulse to accomplish reflex action is reflx arc.
(i)When we are pricked by a needle,the stimulus is the prick which is sensed by inturn triggers an impulse in sensory neuron.
(ii)The sensory neuron transmits or conveys the massage to the spinal cord.
(iii)Spinal cord interprets the stimulus and the impulse is passed on the relay neuron which inturn transmits it to a motor neuron.
(iv)Motor neurons carry command from spinal cord to our arm.
(v)muscle in our arm contracts and we withdraw our hand immediately from the needel.
In this example,muscle is an effector organ which has responded to the pain.