Question

what is mean by respiration

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Answer 1

HELLO ,

Respiration is the process which involves exchange of oxygen and carbon dioxide between the organism and the environment. Respiration is the process by which chemical energy stored in the food is released in the form of ATP along with carbon dioxide and water. Respiration can be of two types – Aerobic and Anaerobic. Both of these respirations take place inside the cell. Aerobic respiration involves breakdown of glucose into carbon dioxide and water in the presence of oxygen. In aerobic organisms, the pyruvate molecule is further broken down in the mitochondria of a cell. The pyruvate molecule that contains three carbon atoms is broken down into three molecules of carbon dioxide and three molecules of water by the action of mitochondrial enzymes. Anaerobic respiration involves the breakdown of food into alcohol and carbon dioxide in the absence of oxygen. The breakdown of glucose to release energy from the cells in anaerobic conditions is fermentation. Under anaerobic conditions prevailing in our muscle cells, the insufficiency of oxygen converts the pyruvate molecules into lactic acid and energy. Accumulation of lactic acid in our muscle cells causes cramps.

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Answer 2

It is a physiological process which takes place within the cell. It is a biochemical process in which food is oxidised and energy is released. CO2 and H2O are by products.