Exercise and Respiration.
The heart rate, breathing rate and breath volume all increase to supply the muscles with more oxygen and glucose for the increase in aerobic respiration.
Anaerobic respiration starts to take place in the muscle cells, when the muscles aren't supplied with enough oxygen during vigorous activity. This causes a build up of lactic acid and creates an oxygen debt. The lactic acid causes the muscles to hurt and stops them contracting efficiently.
Deep breathing for some time after exercise is used to pay back the oxygen debt.
After exercise, blood flowing through the muscles transports the lactic acid to the liver where it is broken down.
The oxygen debt is the amount of extra oxygen the body needs after exercise to react with the lactic acid and remove it from the cells.
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