Why do muscles change their shape in rezponse to nerve impulse?
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Nerve cells and muscle cells are excitable. Their cell membrane can produce electrochemical impulses and conduct them along the membrane. In muscle cells, this electric phenomenon is also associated with the contraction of the cell. ... The origin of the membrane voltage is the same in nerve cells as in muscle cells
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The simplest notion of movement is at the cellular level is that they shorten. Muscle cells have special proteins that change both their shape and their arrangement in the cell in response to nervous electrical impulses. When this happens, new arrangements of these proteins give the muscle cells a shorter form. Thus, the muscle contracts.
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