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Describe The Process Of Excitation-Contraction Coupling In Skeletal Muscle Fibers

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Motor units are connected at neuromuscular junction. Specifically, the neuronal axon and the sarcolemma of muscle meet, forming the motor end-plate. Acetylcholine is released from axon down into muscle membrane causing a graded depolarization of the end-plate potential. Depolarization of end-plate leads to increase in calcium released by sarcoplasmic reticulum, and more calcium is used by action and myosin of sarcomeres to cause contraction.

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