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Electronic signals are sent through the nuerons of the brain to the sight of desired movment. When they reach this spot the signals close an electric pathway and tell to muscle to expand or contract.

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16y ago
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15y ago

The physiology of muscles is complex and can not be completely explained in a reasonable amount of time. The following is an extremely truncated explanation. Muscles is composed of interwoven fibers made of titin and actin. If you fold your hands so your fingers are interwoven, then pull them slightly apart you have a rough model of the sarcomere, the smallest functional unit of muscle. Special motor protein called myosin is located in the sarcomere that utilizes ATP as energy to pull the fibers together (pulling your fingers so your hands move together in our rough model). This produces contraction of a muscle, which allows us to move and perform work. Muscles are passively stretched back to their original length when they stop contracting.

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11y ago

it is due to formation of actin and myosin bands

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Q: How does a muscle cause movement?
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