EVERYDAY SCIENCE

Detailed explanation-1: -During strenuous exercise, muscles face a lack of oxygen and require energy to carry out the work. Glucose is broken down in the lack of oxygen to produce lactic acid and carbon dioxide. Accumulation of lactic acid in the muscles results in muscle cramps.

Detailed explanation-2: -Lactic Acid Buildup Causes Muscle Fatigue and Soreness.

Detailed explanation-3: -Lactic acid production in muscles. As a result, anaerobic respiration and lactic acid fermentation occur within the cells and during extended activity, the built-up lactic acid will keep our muscles painful.

Detailed explanation-4: -Lactic acid fermentation is a type of anaerobic respiration (or fermentation) that breaks down sugars to produce energy in the form of ATP. It is called anaerobic because it occurs in the absence of oxygen. Lactic acid is generated as a byproduct of this reaction, which is what gives this type of fermentation its name.

Detailed explanation-5: -Lactic acid fermentation is the type of anaerobic respiration carried out by yogurt bacteria (Lactobacillus and others) and by your own muscle cells when you work them hard and fast. Figure 15.3.