The first means by which ATP is produced at the onset of contractile activity in a skeletal muscle is

Question

Quizplus · Accepted Answer

At the onset of contractile activity in skeletal muscle, the first means by which ATP is produced is through the transfer of energy and phosphate from creatine phosphate to ADP. This process is known as the creatine phosphate system or the phosphagen system. It provides a rapid source of energy for short bursts of high-intensity exercise, such as weightlifting or sprinting.

Note: While all of the options listed can contribute to ATP production, A is the best choice as it specifically addresses the question of the first means by which ATP is produced at the onset of contractile activity.

The First Means by Which ATP Is Produced at the Onset