Multiple choice

Muscle cramps occur due to

  1. aerobic respiration in muscles

  2. accumulation of pyruvic acid in blood

  3. glycolysis in mitochondria of muscle cells

  4. accumulation of lactic acid in muscles

  5. sudden build up of oxygen in cells

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

Anerobic respiration takes place in cases of vigorous physical exercise when oxygen gets used up faster in muscle cells than is being supplied by blood. This can cause sudden build up of lactic acid, which causes cramps.