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| heart; involuntary movement |
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| separates and holds individual skeletal muscles in place |
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movable end of muscle
*when a muscle contracts, its insertion is pulled TOWARD its origin* |
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| Muscle responsible for most movement |
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| resist prime mover's action and are responsible for movemnt in OPPOSITE direction |
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| minimal strength needed to cause contraction |
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| muscle fibers within a muscle are organized in to motor units. |
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| contains many mitochhondria and myofibrils whcih lie parallel |
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are key in muscle contraction they contain 2 kinds of protein filaments:
myosin
actin |
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| actin filaments are attached to it at the ewnd of I band |
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| is the protein of the myofibril between 2 successive Z lines |
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| decrease in size and strength |
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| prgressively crippling disease, muscles atrophy |
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| chronic; muscles easily fatigued |
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| loss of ability to move body part |
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| partial paralysis of muscles |
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| sorness of foront of lower leg, kue to straining, often as result of walking up and down hills |
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| sternocleidomastoid contract involuntary |
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