During cellular metabolism, CO2 is produced from the metabolism of which macronutrients?

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Multiple Choice

During cellular metabolism, CO2 is produced from the metabolism of which macronutrients?

Explanation:
CO2 is produced when the body oxidizes the major fuel sources: carbohydrates, fats, and proteins. Glucose from carbohydrates is oxidized through glycolysis and the TCA cycle, releasing CO2. Fatty acids from lipids are broken down (beta-oxidation) to acetyl-CoA, which enters the TCA cycle and yields CO2. Proteins provide amino acids that, after deamination, feed into the TCA cycle and other metabolic pathways, generating CO2 as they are oxidized. Nucleic acids are not a primary energy source, so they don’t contribute CO2 in the same way. That’s why the correct choice includes glucose, lipids, and proteins.

CO2 is produced when the body oxidizes the major fuel sources: carbohydrates, fats, and proteins. Glucose from carbohydrates is oxidized through glycolysis and the TCA cycle, releasing CO2. Fatty acids from lipids are broken down (beta-oxidation) to acetyl-CoA, which enters the TCA cycle and yields CO2. Proteins provide amino acids that, after deamination, feed into the TCA cycle and other metabolic pathways, generating CO2 as they are oxidized. Nucleic acids are not a primary energy source, so they don’t contribute CO2 in the same way. That’s why the correct choice includes glucose, lipids, and proteins.

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