40. Which statement about lactic acid is correct?A Lactic acid is a product of anaerobic respiration in yeast.B Lactic acid build-up in tissues can lead to an oxygen debt.C Lactic acid is produced from sucrose during anaerobic respiration.D Lactic acid is transported from the liver to the muscles after exercise.
Question
- Which statement about lactic acid is correct?A Lactic acid is a product of anaerobic respiration in yeast.B Lactic acid build-up in tissues can lead to an oxygen debt.C Lactic acid is produced from sucrose during anaerobic respiration.D Lactic acid is transported from the liver to the muscles after exercise.
Solution
The correct statement about lactic acid is B. Lactic acid build-up in tissues can lead to an oxygen debt.
Here's why:
A. Lactic acid is not a product of anaerobic respiration in yeast. Yeast performs fermentation which results in ethanol and carbon dioxide, not lactic acid.
B. During intense exercise when the oxygen supply to muscles is insufficient, the body switches to anaerobic respiration which results in the production of lactic acid. This lactic acid build-up can lead to muscle fatigue and cramps, a state often referred to as oxygen debt.
C. Lactic acid is not produced from sucrose during anaerobic respiration. It is produced from glucose or glycogen.
D. Lactic acid is not transported from the liver to the muscles after exercise. It's the other way around. Lactic acid produced in the muscles during exercise is transported to the liver where it is converted back to glucose.
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