Muscles are what we usually call flesh. They have the power

of contraction and consequently of expansion also. When a

muscle contracts, it becomes shorter and thicker like a

piece of India- rubber- its two ends coming neater each

other. Source of supply of energy to the muscle is the

combustion of the glucose supply to the muscle to the muscle

by blood and oxygen it carries with it

There ate two types of muscles

(a) Voluntary, and

(b) Involuntary.

(a)Voluntary:- Voluntary muscles are those with we can

contract whenever we wish it which we move at will. These

ate joined to the bones at either end by chords. When a

muscle of this kind contracts, it pulls one of the bones

towards the other. Since a muscle cannot ?push? , an

opposing muscle brings the bent bone in the straight position.

(b)Involuntary muscles :- Involuntary muscles are not

connected with any bones and we have no control over them.

The heart, the blood ?vessels, hair follicles the interior

of the eye, alimentary canal, bladder and uterus, the

respiratory organs inside the body al these are covered by

these muscles. They do their work not under the command of

man: hence they are involuntary muscles.