Excitation-Contraction (EC) coupling in skeletal muscle.

Excitation-contraction (EC) coupling in skeletal muscle refers to the process by which an electrical signal (action potential) is transformed into a mechanical response (muscle contraction). The process begins when a motor neuron releases acetylcholine (ACh) at the neuromuscular junction, binding to receptors on the muscle fiber's sarcolemma (cell membrane). This binding generates an action potential in ______ ______ ___ _______ ____ _________ _________ __________ _____ _____.
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