how action potential travels in muscles?
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Muscle contraction begins when the nervous system generates a signal. The signal, an impulse called an action potential, travels through a type of nerve cell called a motor neuron. ... The chemical message, a neurotransmitter called acetylcholine, binds to receptors on the outside of the muscle fiber.
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The electrochemical gradient across the muscle plasma membrane (more sodium moves in than potassium out) causes a local depolarization of the motor end-plate. ... The action potentials travel from the surface of the muscle cell along the membrane of T tubules that penetrate into the cytosol of the cell
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