Which substance accumulates in muscles during intense exercise due to anaerobic respiration?

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Multiple Choice

Which substance accumulates in muscles during intense exercise due to anaerobic respiration?

Explanation:
When muscles work very hard and oxygen can’t keep up, they switch to anaerobic respiration. In this mode, glucose is broken down without oxygen, producing a small amount of ATP and a by-product called lactic acid. This lactate formation also regenerates NAD+, allowing glycolysis to continue for a bit longer to supply energy. The buildup of lactic acid in the muscles is what gives that burning sensation and fatigue during intense effort. Carbon dioxide and water are produced in other parts of respiration, and oxygen is what’s used up rather than accumulated, so they don’t build up in the muscles in the same way during anaerobic conditions.

When muscles work very hard and oxygen can’t keep up, they switch to anaerobic respiration. In this mode, glucose is broken down without oxygen, producing a small amount of ATP and a by-product called lactic acid. This lactate formation also regenerates NAD+, allowing glycolysis to continue for a bit longer to supply energy. The buildup of lactic acid in the muscles is what gives that burning sensation and fatigue during intense effort. Carbon dioxide and water are produced in other parts of respiration, and oxygen is what’s used up rather than accumulated, so they don’t build up in the muscles in the same way during anaerobic conditions.

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