Muscle contraction steps

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When a muscle is ready to contract, calcium in the muscle fibers exposes myosin-binding sites on actin filaments. Actin−myosin cross-bridges form. By hydrolyzing ATP, myosin heads push up against actin fibrils, contracting the sarcomere. Calcium and ATP presence enables cross-bridge cycling.

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(2)... This process will happen continuously in a cycle as long as Ca+ and ATP are present. Rigor Mortis occurs after you die. The SR deteriorates andCa+ spills out, however there is a lack of ATP (because no oxygen). Ca+ causes myosin/actin attachment, but they cannot detach because of the lack of ATP.  This leaves your muscles in a permanent binding state of binding of myosin/actin. Biology Cell, Tissue Biology, Anaerobic Respiration, Newspaper Design Layout, Rigor Mortis, Basic Anatomy And Physiology, Medical Photos, Medical School Studying, Muscle Contraction

(2)... This process will happen continuously in a cycle as long as Ca+ and ATP are present. Rigor Mortis occurs after you die. The SR deteriorates andCa+ spills out, however there is a lack of ATP (because no oxygen). Ca+ causes myosin/actin attachment, but they cannot detach because of the lack of ATP. This leaves your muscles in a permanent binding state of binding of myosin/actin.

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