P is a cell (or group of cells) in the human body which is sensitive to a particular type of stimulus and conveys the message to CNS through nerves Q. On the other hand, R is part of the human body which can respond to a stimulus according to the instructions sent from the CNS through nerves S.

(a) What is P ? Name give organs which contain cells (or group of cells ) like P.

(b) Name the nerves Q.

(c) What is R ? Give two examples of R.

(d) Name nerves S.

(e) How do messages travel through the nerves Q and S ?

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Solution

(a) P is a receptor; eyes ears, nose, tongue and skin.

(b) Sensory nerves

(c) Effector; muscles and glands

(d). Motor nerves

(e) in the form of electrical impulses.

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Similar questions

	List I		List II
A	Cyton	p	The body of the nerve cell that contains the organelles.
B	Dendrite	q	Receives the stimuli sent from another nerve or the outside environment.
C	Axon	r	A fatty substance that covers the axon of the nerve cell and speeds.
D	Myelin sheath	s	The long, thin section of the nerve cell where the impulse is transmitted across.

(a) Why are nerve cells long and have branches ?
(b) What is the other name of a nerve cell ?

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