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 Structure:
Muscles make up one-half of the bodyÕs weight. For locomotion, skeletal
muscle is used. Skeletal muscles
use the bones of the axial
skeleton as levers for establishing postures and changing the positions
of the body.
 Function:
Skeletal muscles have four main functions: maintaining posture, stabilizing
joints, producing movement, and generating
heat. Breathing is a function
of the skeletal muscles. Since skeletal muscles are under the control of
one's choice, they are called voluntary muscles. After the decision is
made in the motor cortex of the cerebrum, the
motor nervous system carrys the signal
to the muscles. Some of the many functions of cardiac and smooth muscles
are control of the circulatory,
digestive, excretory
and reproductive
systems.
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