chapter 9
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what are the two things muscle contractions depend on?
actin ; myosin
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the ability to receive and respond to stimuli
Excitability
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the ability to shorten forcibly
contractility
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the ability to recoil and resume the original resting length
elasticity
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what maintains posture, stabilize joints, and generates heat?
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densely packed, rodlike contractile elements
myofibrils
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the smallest contractile unit of a muscle
sarcomere