Most of the ATP supplies for a skeletal muscle undergoing one hour of sustained exercise come from
A)creatine phosphate.
B)glycolysis.
C)substrate phosphorylation.
D)oxidative phosphorylation.
E)de novo synthesis.

Question

Quizplus · Accepted Answer

During sustained exercise, the primary source of ATP for skeletal muscle comes from oxidative phosphorylation, which occurs within the mitochondria. Glycolysis and creatine phosphate can provide energy for short bursts of activity, but are not sufficient for prolonged exercise. Substrate phosphorylation and de novo synthesis also do not contribute significantly to ATP production during exercise.

Most of the ATP Supplies for a Skeletal Muscle Undergoing