Multiple choice

Name the substances whose build up in the muscles during vigorous physical exercise may cause cramps?

  1. Ethanol + Carbon dioxide + Energy

  2. Lactic acid + Energy

  3. Carbon dioxide + Water + Energy

  4. Pyruvate

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

During vigorous exercise, muscle cells may lack sufficient oxygen, leading to anaerobic respiration which produces lactic acid as a byproduct, causing muscle fatigue and cramps.