In which of the following component of the body, lactic acid fermentation takes place?
Correct answer: D. Muscles
- A. Brain
- B. Heart
- C. Liver
- D. Muscles
Explanation
Lactic acid fermentation occurs in muscle cells when oxygen supply is insufficient, allowing glycolysis to continue by regenerating NAD+. The likely alternative is the heart, because it also uses respiration, but cardiac muscle normally depends mainly on aerobic respiration and does not commonly accumulate lactic acid.
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About Cellular Respiration
Cellular respiration releases energy from glucose through glycolysis, the link reaction, the Krebs cycle and the electron transport chain, producing ATP. The pathway differs in oxygen availability: aerobic respiration uses oxygen and yields more ATP, while anaerobic respiration produces much less ATP and forms lactic acid in muscles or ethanol and carbon dioxide in yeast.
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