NCERT Solution Class X Science Control and Coordination Question 4 (Ex 7.4)

Question 4:

What is the function of receptors in our body? Think of situations where receptors do

not work properly. What problems are likely to arise?

Answer:

Receptors are sensory structures (organs/tissues or cells) present all over the body.

The receptors are either grouped in case of eye or ear, or scattered in case of skin.

Functions of receptors:

(i) They sense the external stimuli such as heat or pain.

(ii) They also trigger an impulse in the sensory neuron which sends message to the

     spinal cord.When the receptors are damaged, the external stimuli transferring

     signals to the brain are not felt. For example, in the case of damaged receptors,

     if we accidentally touch any hot object, then our hands might get burnt as

     damaged receptors cannot perceive the external stimuli of heat and pain.

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