MDCAT Biology MCQ #387

During intense exercise, skeletal muscles lack sufficient oxygen and convert pyruvate into another product to regenerate NAD+. What is this product?

MDCAT Biology MCQ #387

  1. Question 1

    Q1. During intense exercise, skeletal muscles lack sufficient oxygen and convert pyruvate into another product to regenerate NAD+. What is this product?

    • A) Ethanol
    • B) Acetaldehyde
    • C) Acetyl-CoA
    • D) Lactic acid

    Answer: Lactic acid

    Explanation: Lactic acid is produced in muscles during anaerobic conditions; Ethanol and acetaldehyde are products of yeast fermentation, not human muscle.