Identify the process in which a molecule of glucose produces only 2 ATP molecules in animals in an environment with limited oxygen. What are the by-products of this process?
A
Process: Anaerobic respiration; By-products: Ethanol + Water + Energy
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B
Process: Anaerobic respiration; By-products: Lactic Acid + CO2 + Energy
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C
Process: Aerobic respiration; By-products: Water + CO2 + Energy
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D
Process: Anaerobic breathing; By-products: Ethanol + CO2 + Energy
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Solution
The correct option is B Process: Anaerobic respiration; By-products: Lactic Acid + CO2 + Energy Anaerobic respiration happens in muscles during hard exercise.
Glucose → Lactic acid + Energy + Carbon dioxide
Glucose is not completely broken down, so less energy is released than during aerobic respiration.
There is a build-up of lactic acid in the muscles during vigorous exercise. The lactic acid needs to be oxidised into carbon dioxide and water later.
The creation of lactic acid (which needs oxygen to be broken down) generates an oxygen debt that needs to be repaid after the exercise stops. This is why we keep breathing deeply for a few minutes after we have finished exercising.