The major fuel source used by the working muscle during long-duration physical activity is
A) amino acids.
B) fatty acids.
C) glycogen.
D) glucose.

Question

Quizplus · Accepted Answer

During long-duration physical activity, the major fuel source used by the working muscle is fatty acids. This is because glycogen stores become depleted after a certain period of time, and the body begins to rely on fat stores for energy. Glucose and amino acids can also be used as fuel sources, but they are not the primary source during long-duration activity.

The Major Fuel Source Used by the Working Muscle During