Respiration - Is the release of energy from glucose in the muscles.
When the body is at rest this is aerobic respiration. As you exercise you breathe harder and deeper and the heart beats faster to get oxygen to the muscles.
Glucose + oxygen → energy + water + carbon dioxide
When exercising very hard, the heart cannot get enough oxygen to the muscles. Respiration then becomes anaerobic.
Glucose → energy + lactic acid
Aerobic- is exercising with oxygen
Anaerobic - is exercising without oxygen
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