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Glycolysis – Is the metabolic pathway of making pyruvate (3 carbon sugar) and ATP, carbon dioxide is not a byproduct of the glycolysis
Krebs cycle – At the Krebs cycle (during normal mammalian respiration) CO2 is released regularly. And it is the only source of this product in the cell.
Most organisms cannot respire without oxygen, but some organisms and tissues can continue to respire if the oxygen runs out. In conditions of low or no oxygen, the process of anaerobic respiration occurs. The ‘an’ in ‘anaerobic’ means “without.”
During anaerobic respiration, the oxidation of glucose is incomplete – not all of the energy can be released from the glucose molecule as it is only partially broken down. The reaction, therefore, releases much less energy than aerobic respiration – around only a nineteenth of the energy released during aerobic respiration. This means that fewer molecules of ATP can be made.
Glucose in human muscle cells is converted to lactic acid during anaerobic respiration:
glucose → lactic acid ( ATP made)
Lactic acid is a waste product.
The answer is only the Krebs cycle, A
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