Question

Cramps in the leg muscle after running a long distance is because of

• A. Build up of glucose
• B. Build up of alcohol
• C. Build up of lactic acid
• D. Build up of energy

Answer 1

The correct option is C Build up of lactic acid

The build-up of lactic acid due to anaerobic respiration in muscle cells when there isn't sufficient oxygen available for aerobic respiration (which is the case during vigorous exercise) leads to fatigue and results in cramps. So, the correct answer is option C.