Question

why is the burning of plasma - free fatty acids greatest during low - to moderate - level physical activity?
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
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
they are not. plasma - free fatty acids are the primary fuel sources during strenuous physical activity

Explanation:

During low - to moderate - level physical activity, plasma - free fatty acids are not the primary fuel source. Intramuscular triglycerides and carbohydrates are. Plasma - free fatty acids come from adipose cell triglycerides. It takes time for adipose cell triglycerides to be broken down, transported to muscle tissue, and utilized for energy. This process is more efficient during low - to moderate - level activity where the energy demand is not as rapid as in strenuous activity.

Answer:

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