Cellular respiration explains why animals breathe rapidly when they are running because 'energy is used up while running, and cellular respiration needs oxygen to produce more energy'
Cellular respiration is a series of metabolic reactions by which aerobic cells produce energy in the form of ATP, the energy coin of the cell.
During this process (cellular respiration), cells use oxygen and nutrients (eg., glucose molecules) to synthesize ATP.
Cellular respiration has three main stages: glycolysis, the Krebs cycle and oxidative phosphorylation.
Oxygen is the last electron acceptor in the electron transport chain of oxidative phosphorylation.
In conclusion, cellular respiration explains why animals breathe rapidly when they are running because 'energy is used up while running, and cellular respiration needs oxygen to produce more energy'.
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