Respuesta :
The total supply of ATP and creatine phosphate in a muscle is enough to power contraction for about 1 minute.
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.
A molecule called creatine phosphate has phosphate links that can store energy. 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 produce ATP and creatine when the muscle begins to contract and needs energy. The enzyme creatine kinase catalyzes this reaction, which happens very quickly and fuels the initial seconds of muscular contraction using ATP produced from creatine phosphate.
Hence, with proper supply of ATP along with creatinine phosphate the power contraction can occur for 1 min.
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