Why does carbohydrate fermentation in the colon produce gas, rather than complete oxidation to CO2 and H2O as occurs during cellular respiration?

💡 Explanation

Carbohydrate fermentation in the colon produces gas because anaerobic bacteria metabolize carbohydrates without oxygen, producing short-chain fatty acids and gases (H2, CO2, CH4) via glycolysis, rather than using oxidative phosphorylation in mitochondria. Therefore, fermentation generates gas rather than complete oxidation, because mitochondria aren't involved and the process is anaerobic.

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