The Latin word Respirae means to breathe. The biochemical process in which complex organic compounds in living cells are oxidized to simple compounds and static energy is converted into kinetic energy is called respiration. Respiration is a powerful oxidative process that transfers energy. ATP is produced in the organism as a result of respiration. This ATP provides energy for all physiological functions of the organism. Growth occurs in the cytoplasm and mitochondria of cells. It takes place 24 hours a day and night.
C6H12O6 +6O2+6H2O→ 6CO2+12H2O+36ATP(CH3-CO-COOH)