When a muscle has been repeatedly contracting at a moderate intensity for an extended period of time (more than a few minutes),what is the primary source of ATP?

Question

When a muscle has been repeatedly contracting at a moderate intensity for an extended period of time (more than a few minutes),what is the primary source of ATP?

Quizplus · Accepted Answer

When a muscle has been repeatedly contracting at a moderate intensity for an extended period of time, the primary source of ATP is oxidative phosphorylation, which involves the use of oxygen in the mitochondria to produce ATP through the electron transport chain. This process is more efficient than glycolysis or creatine phosphate breakdown and can sustain muscle contraction for a longer period of time.

Therefore, options A, B, D, and E are incorrect as they do not provide the most efficient source of ATP for sustained muscle contraction.

When a Muscle Has Been Repeatedly Contracting at a Moderate