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The body requires large amounts of energy to perform vigorous physical activity. Which of these is NOT an energy system that helps contribute to the body’s total energy needs during exercise?

Aerobic
Anaerobic glycolysis
Phosphagen
Photosynthesis

Explanation

Answer: D - Photosynthesis is the means of energy production used by plants, NOT humans; photosynthesis uses sunlight as its primary substrate. In humans, the aerobic system slowly produces ATP from blood glucose, glycogen, fatty acids, and proteins. Anaerobic glycolysis quickly produces ATP from glucose found in blood and muscle and from glycogen. The phosphagen system very quickly produces ATP from creatine phosphate and ATP.

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