The primary fuel source during high-intensity (85% VO₂ max)exercise is A)muscle glycogen. B)blood glucose. C)muscle triglycerides. D)plasma FFA.

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During high-intensity exercise, the primary fuel source is muscle glycogen. This is because the body needs energy quickly and efficiently, and glycogen can be broken down and provide energy quickly. Blood glucose, muscle triglycerides, and plasma FFA are also sources of energy during exercise, but they are primarily used during lower intensity exercise or during the post-exercise recovery period.

The Primary Fuel Source During High-Intensity (85% VO2 Max)exercise Is

The Primary Fuel Source During High-Intensity (85% VO₂ Max)exercise Is