the body, the second is to remove waste and CO2 from the cells and the third is to maintain body temperature. When you exercise, the heart has to pump faster to supply the muscles with enough blood to sustain them. This also increases your breathing rate because there is more blood to be oxygenated (Rickard, Phillips, Johnstone, & Roberson, 2006). Humans get energy from aerobic respiration, which happens in cells. In this process, glucose (C6H12O6) combines with oxygen to give off CO2, H2O and…
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