Question

When we touch a hot plate unknowingly, then this heat is sensed by a receptor P present in our fingers. The receptor triggers an impulse in neuron Q which transmits the message to an organ R which is a part of the central nervous system. Here the impulse is passed on to a neuron S which in turn passes it to a yet another neuron T. The neuron T passes the impulse to a tissue U in our arm. The tissue U then contracts and pulls our hand away from the hot plate.​ ​
(d) What name is given to the phenomenon in which hand is pulled away quickly from the hot plate?​ ​

Answer 1

Reflex action.​ ​

• If we unknowingly touch a hot plate, we immediately move our hand away from it. So, moving our hand away on touching a hot plate is an example of reflex action.​