Rigor mortis

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10.3: Muscle Fiber Contraction and Relaxation - Medicine LibreTexts Muscle Contraction Steps, Muscle Fiber, Smooth Muscle, Rigor Mortis, Basic Anatomy And Physiology, Exercise Physiology, Musculoskeletal System, Muscular System, Medicine Student

The sequence of events that result in the contraction of an individual muscle fiber begins with a signal—the neurotransmitter, ACh—from the motor neuron innervating that fiber. The local membrane of the fiber will depolarize as positively charged sodium ions (Na+) enter, triggering an action potential that spreads to the rest of the membrane will depolarize, including the T-tubules.

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