Science
Which of the following options indicates the products formed after breakdown of the glucose in our muscle cells when there is lack of oxygen?
options
- Ethanol + carbon dioxide + Energy
- Lactic acid + Energy
- Lactic acid + carbon monoxide + Energy
- Carbon dioxide + Water + Energy
Respiratory System
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Answer
Lactic acid + Energy
Reason — In our muscle cells, when we perform vigorous physical activity such as running or exercising, the demand for energy increases. However, the oxygen supply becomes insufficient for complete breakdown of glucose through aerobic respiration.
Under this condition, anaerobic respiration takes place in the muscle cells. During this process, glucose is partially broken down in the absence of oxygen to form lactic acid and a small amount of energy.
The chemical equation for this process is:
C6H12O6(Glucose) → C3H6O3(Lactic acid) + Energy
The accumulation of lactic acid in the muscles causes muscle fatigue and cramps. Once oxygen becomes available again, lactic acid is converted back into carbon dioxide and water with the release of more energy.
Thus, in the absence of oxygen, glucose breaks down into lactic acid and energy in human muscle cells.
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