What builds up in muscles after prolonged exercise without rest?

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Multiple Choice

What builds up in muscles after prolonged exercise without rest?

Explanation:
When muscles work hard without enough rest, they rely more on glycolysis for quick ATP. If oxygen supply can’t keep up with demand, pyruvate from glycolysis is converted to lactate to regenerate NAD+, allowing glycolysis to continue. This lactate accumulation in the muscle, often called lactic acid buildup, is associated with the burning sensation and fatigue because it lowers the muscle’s pH. Oxygen isn’t building up here; it’s the limited supply relative to demand. ATP and glucose are being used rather than accumulating, so they don’t explain the buildup.

When muscles work hard without enough rest, they rely more on glycolysis for quick ATP. If oxygen supply can’t keep up with demand, pyruvate from glycolysis is converted to lactate to regenerate NAD+, allowing glycolysis to continue. This lactate accumulation in the muscle, often called lactic acid buildup, is associated with the burning sensation and fatigue because it lowers the muscle’s pH. Oxygen isn’t building up here; it’s the limited supply relative to demand. ATP and glucose are being used rather than accumulating, so they don’t explain the buildup.

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