Why is the burning of plasma-free fatty acids greatest during low- to moderate-level physical activity?

Question

Multiple Choice

They are not. During low- to moderate-level physical activity intramuscular triglycerides and carbohydrates are the primary fuel sources.

Because it takes time for adipose cell triglycerides to be broken down, transported to the muscle tissue, and then utilized for energy.

They are not. Plasma-free fatty acids are the primary fuel sources during strenuous physical activity.

Because there is a great amount of plasma-free fatty acids so they are always ready for use in low- to moderate-level physical activity.

Answer 1

The correct answer is:

Because it takes time for adipose cell triglycerides to be broken down, transported to the muscle tissue, and then utilized for energy.

During low to moderate levels of physical activity, the body primarily utilizes fat as a fuel source, including plasma-free fatty acids. However, it takes time for the body to mobilize fat from adipose tissue and transport it to the muscles for energy. In contrast, during higher-intensity activities, the demand for quick energy leads to a greater reliance on carbohydrates. Therefore, the process of breaking down and utilizing plasma-free fatty acids is more efficiently matched with lower intensity activities.