In the first few seconds of skeletal muscle contraction,what is the main mechanism by which ATP is replenished?
A)Energy and phosphate are transferred from creatine phosphate to ADP.
B)Oxidative phosphorylation rapidly generates ATP from glucose.
C)Glycolysis produces ATP from glycogen.
D)Oxidation of fatty acids into ATP occurs in the mitochondria.
E)Myoglobin catalysis produces ATP.

Question

Quizplus · Accepted Answer

During the first few seconds of skeletal muscle contraction, the main mechanism by which ATP is replenished is the transfer of energy and phosphate from creatine phosphate to ADP. This process, known as the creatine phosphate system, provides a rapid source of ATP for immediate use by the muscle. Glycolysis and oxidative phosphorylation also play a role in providing energy during sustained muscle contraction. However, these processes take longer to ramp up and are not as immediate as the creatine phosphate system. Myoglobin does not catalyze the production of ATP, but rather helps to store oxygen within the muscle fibers. Fatty acid oxidation takes place in the mitochondria and provides ATP for longer duration activities.

In the First Few Seconds of Skeletal Muscle Contraction,what Is