Q32 of 231 Page 116

What is meant by receptors and effectors? Give two examples of each.

A receptor is an organ or cell able to respond to heat, light or other external stimulus and transmit a signal to a sensory nerve. Example: Photoreceptor (a receptor which detects light) and phonoreceptor (a receptor which detects sound).

An effector is a muscle, gland or an organ capable of responding to a stimulus, especially a nerve impulse.


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31

Fill in the following blanks with suitable words:

(a) The two examples of effectors are .................and .....................


(b) Our..................system allows us to react to our surroundings. Information from receptors passes along.................neurons to our brain. Our brain sends impulses along...........neurons to our muscles.


(c) A neuron which carries an impulse to the brain is called a .................... neuron.


(d) The neuron which carries a message for action to a muscle or gland is known as a.................... neuron.

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What are the various sense organs in our body?

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