When a Muscle Is Stimulated to Contract Aerobically, Less Lactic

question 94

Multiple Choice

When a muscle is stimulated to contract aerobically, less lactic acid is formed than when it contracts anaerobically because:

• A) glycolysis does not occur to significant extent under aerobic conditions.
• B) muscle is metabolically less active under aerobic than anaerobic conditions.
• C) the lactic acid generated is rapidly incorporated into lipids under aerobic conditions.
• D) under aerobic conditions in muscle, the major energy-yielding pathway is the pentose phosphate pathway, which does not produce lactate.
• E) under aerobic conditions most of the pyruvate generated as a result of glycolysis is oxidized by the citric acid cycle rather than reduced to lactate.

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