Describe the process of relaxation of a skeletal muscle fiber.

ppk

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12 years ago

Describe the process of relaxation of a skeletal muscle fiber.

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Human Physiology: An Integrated Approach

Edition: 8^th

Author: Silverthorn

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duddy

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12 years ago

Relaxation is a passive process, resulting from loss of acetylcholine from the receptors as ACh is broken down and there is no further release. This allows the muscle cell to repolarize, which stops the release of calcium from the sarcoplasmic reticulum (SR). The pumping of calcium back into the SR causes the troponin to block the binding site on actin for myosin; this allows the crossbridges to detach and the cell to relax.

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