 Skeletal
muscles move and support the skeleton. They make up fifty percent of your
body weight. There are 640 individually named skeletal muscles. A skeletal
muscle links two bones across its connecting joint.
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- When
these muscles contract or shorten, your bone moves. Muscles are arranged
in layers over the bones. Those nearest to the skin are called superficial
muscles. Those closest to the inside of the body are called deep muscles.
Skeletal muscles are voluntary muscles. These are muscles that we can
consciously control.
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- A
muscle's name usually describes its shape, location or job. Some skeletal
muscles are:
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frontalis
(forehead)
deltoid (moves shoulder and upper arm)
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biceps
(bends arm)
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rectus
abdominis (stomach)
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sartorius
(bends and turns leg)
Muscles need oxygen and food for energy from
your blood in order to work properly. If they work hard but do not
get enough, they may go into a spasm and you feel the pain of a cramp.
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