Food that is required for life processes comes from photosynthesis. Cellular respiration results in the release of energy used for the synthesis of ATP which involves glycolysis.
Aerobic respiration leads to complete oxidation of organic substances in the presence of oxygen, which is common in higher organisms.
To release and utilize the energy stored in molecules, they undergo the following steps: electron transport system and oxidative phosphorylation.
Another important aspect of respiration is the respiratory quotient. The ratio of the volume of carbon dioxide released to the volume of oxygen consumed gives the respiratory quotient.
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