Question

During strenuous exercise, glucose is changed into

• A. Starch
• B. Glycogen
• C. Lactic acid
• D. Pyruvic acid

Answer 1

Answer: (C)

Lactic acid

• During strenuous exercise, when oxygen becomes inadequate for cellular respiration, muscle cells convert pyruvic acid (end product of glycolysis) to lactic acid and regenerate NAD${}^{+}$ to allow glycolysis to continue under anaerobic conditions and produce ATP.
  
• Glycogen and starch are polymers and main storage forms of glucose in animal body. They are converted to glucose and metabolised for ATP production.