MUSCLE PHYSIOLOGY

Detailed explanation-1: -Muscle cells opt for lactic acid fermentation due to less availability of oxygen. In this process they produce lactic acid and less energy per glucose molecule.

Detailed explanation-2: -Lactic acid is a byproduct of anaerobic metabolism, in which the body produces energy without using oxygen. Since the discovery of lactic acid, the popular notion has been that it is responsible for muscle fatigue and also tissue damage induced by the lactic acid following an intense workout.

Detailed explanation-3: -Lactic acid accumulates in your muscle cells as fermentation proceeds during times of strenuous exercise. During these times, your respiratory and cardiovascular systems cannot transport oxygen to your muscle cells, especially those in your legs, fast enough to maintain aerobic respiration.

Detailed explanation-4: -In the absence of oxygen, oxidative phosphorylation cannot be used to produce ATP, so glycolysis becomes the primary source of ATP for the cell. The importance of lactic acid fermentation is that it replenishes cellular for the glyceraldehyde-3-phosphate dehydrogenase reaction, which precedes the ATP-producing steps.