When a person is performing intense physical exercise and begins to feel fatigue and a burning pain in the muscles, the response of the muscles is to synthesize more ____.

Question

Quizplus · Accepted Answer

During intense physical exercise, when the body is not receiving sufficient oxygen, the muscles shift to anaerobic respiration and produce energy by breaking down glucose without oxygen. This process produces lactate as a byproduct, which can accumulate in the muscle cells and cause a burning sensation and fatigue. To keep meeting the energy demands of the body, the muscles try to synthesize more lactate. Therefore, option A is the best choice.

When a Person Is Performing Intense Physical Exercise and Begins