Introducing video: How our muscles work Muscle contraction is produced by an interaction of the protein molecules of actin and myosin, which in turn occurs due to the sliding between thick and thin myofilaments, this sliding causes a decrease in the amplitude of band A and zone H. Calcium (Ca) is the link between excitement and contraction of a muscle. The sarcoplasmic reticulum is specialized for its storage and release of calcium through the T system. When a nerve signal arrives at the muscle cell, a release of calcium is initiated into the fluid surrounding the filaments from special storage vesicles in the reticulum Sarcoplasmic, when combined with troponin, initiates the elimination of an impediment for a potential interaction between the actin and myosin filaments. In any case, the tropomyosin, which in the resting muscle has turned off the active sites of actin, can now activate them; In turn the actin can activate the ATP hydrolysis of the myosin heads. This allows ...
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