Definition: Living organisms need energy, which is provided by the phenomenon of respiration. It is the process by which organism’s breakdown complex compounds containing carbon to get a maximum of usable energy. Generally respiration means the exchange of respiratory gases (CO2 and O2) between the organism and its environment. This exchange is called external respiration, which is followed by cellular respiration. Cellular respiration is the process by which energy is made available to cells in a step-be-step breakdown of C-chain molecules in the cells.
Aerobic Respiration
In most of the higher and larger organisms, the glucose etc. is oxidized by using molecular oxygen. This type of respiration is known as aerobic respiration.
In aerobic respiration a mole of glucose is oxidized completely into carbon dioxide and water releasing enormous amount of energy. One glucose molecule in this respiration produces 686, 000 calories of energy. Aerobic respiration thus produces 20 times more energy than the anaerobic respiration.
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