Anaerobic Respiration Causes Oxygen Debt

Steps:

• Recognize oxygen debt as buildup of lactic acid in muscles when oxygen supply lags during intense exercise.
• Identify aerobic respiration requires oxygen and produces no lactic acid.
• Recall anaerobic respiration in animal muscles converts glucose to lactic acid without oxygen.
• Match the equation for muscle anaerobic respiration to option B.

Why B is correct:

• It represents anaerobic respiration in muscles, where glucose ferments to lactic acid and CO₂, causing oxygen debt as the body later repays it by oxidizing lactic acid aerobically.

Why the others are wrong:

• A: Shows aerobic respiration, which uses oxygen and avoids debt.
• C: Depicts alcoholic fermentation in yeast, not muscle respiration.
• D: Incorrectly includes water, which is not produced in anaerobic muscle respiration.

Final answer: B