Question

What is the primary source of energy for skeletal muscle during intense activity?

• A. Fatty acids
• B. Glycogen
• C. Ketone bodies
• D. Amino acids

Hint:

{Muscle glycogen} is the main fuel for {high-intensity exercise}, as it can rapidly produce ATP through glycolysis.

Answer 1

The Correct Option is B

Concept: During intense physical activity, skeletal muscles require rapid energy production. The body uses stored carbohydrates in the form of glycogen to generate energy quickly through glycolysis. Glycogen stored in muscle tissue is broken down into glucose, which is rapidly metabolized to produce ATP.
Step 1: Identify the main energy source during intense muscle activity.

• Fatty acids – Used mainly during prolonged, low-intensity exercise.
• Glycogen – Primary and rapid energy source during intense activity.
• Ketone bodies – Used during prolonged fasting.
• Amino acids – Used minimally for energy.

Therefore, the primary energy source for skeletal muscle during intense activity is Glycogen.