Anaerobic respiration in humans produces lactic acid without CO2

Steps:

• Identify anaerobic respiration as energy production without oxygen.
• Recall that in humans, this occurs in muscle cells via lactic acid fermentation.
• Note the simplified equation: glucose is converted to lactic acid for ATP.
• Eliminate options mentioning alcohol or CO2, as they apply to other organisms.

Why B is correct:

• Lactic acid fermentation in humans follows the reaction C6H12O6 → 2 CH3CH(OH)COOH, simplified as glucose → lactic acid, producing ATP without oxygen or CO2.

Why the others are wrong:

• A: Represents alcoholic fermentation in yeast, producing ethanol and CO2.
• C: Incorrectly includes carbon dioxide, not produced in human anaerobic respiration.
• D: Adds CO2 explicitly, which is absent in the human process.

Final answer: B