AP BIOLOGY

Detailed explanation-1: -Fatigue in muscles is caused by a build-up of lactic acid, which is produced during anaerobic respiration (when there is insufficient oxygen). Oxygen debt After exercise, the lactic acid has built up and caused an extra need for oxygen – called the oxygen debt.

Detailed explanation-2: -In animal cells and in some bacterial cells, anaerobic respiration is called lactic acid fermentation, a process that produces two molecules of lactic acid by breaking down one molecule of glucose.

Detailed explanation-3: -a temporary oxygen shortage in the body tissues arising from exercise is called oxygen debt. In details, Oxygen debt is the oxygen required (after vigorous exercise, using up the oxygen faster than it can be breathed in) to oxidize lactic acid, created from anaerobic cellular respiration.

Detailed explanation-4: -As explained above, oxygen debt occurs when there is not enough oxygen to keep up with the demand for energy, which is converted from glucose stores. The conversion of glucose produces unwanted lactic acid that oxygen helps to eliminate.