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Explain how ATP and creatine phosphate function in skeletal muscle fiber contraction.

Sagot :

In a muscle at rest, extra ATP converts creatine into ADP and creatine phosphate by transferring its energy. This serves as a source of energy that may be swiftly drawn upon to produce further ATP.

Creatine phosphate transfers its phosphate back to ADP to form ATP and creatine when the muscle begins to contract and needs energy.

ATP provides the necessary energy for muscular contraction. The active-transport Ca++ pumps in the SR are powered by ATP, which also plays a direct role in the cross-bridge cycle. Without enough ATP, muscle contraction is impossible. Only a few seconds' worth of muscular contractions can be powered by the tiny quantity of ATP that is stored in muscle. To enable persistent contraction, ATP must be rapidly created and supplied as it is depleted. Three processes—creatine phosphate metabolism, anaerobic glycolysis, fermentation, and aerobic respiration—can regenerate ATP.

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