The first means by which ATP is produced at the onset of contractile activity is

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Quizplus · Accepted Answer

The transfer of energy and phosphate from creatine phosphate to ADP rapidly produces ATP during the onset of contractile activity, providing a quick source of energy for muscle contraction. Glycolysis and oxidative phosphorylation also contribute to ATP production, but they are slower processes that require oxygen and glucose. Degradation of myoglobin is not a significant source of ATP production in muscle cells.

The First Means by Which ATP Is Produced at the Onset