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contract or relax makes them shorter or thicker
stimulated by nervous tissue
600 in the body
work in pairs one contracts the other relaxes
overworked or stretched
may have small tear in the muscle, blood vessel or nerve fibers
caused by sudden or other quick movements and you haven't warmed up
pain even when at rest redness swelling
ice packs rest ibuprofen for a few days
a skeletal muscle contracts on its own or twitches uncontrollably usually calf, thigh, or arch of foot muscle
may be caused byoveruse or imbalance of electrolytes
major functions of skeletal system
provide shape and support
allows movement with help from muscles
protects your organs
produces blood cells
stores minerals until your body needs them
26 small bones called vertebrae
can slide about 12 degrees to the left or right
column can rotate
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