Air is of prime importance for life. One may live for a few days without food or perhaps even without water. But it is impossible to survive even for a minute or two without air.
Oxygen is essential for the process of combustion taking place in all the various cells of the body. We obtain this oxygen from the air. When we inhale, oxygen of the air dissolves in the blood flowing through the fine capillaries in the lungs, and is thus carried to every cell in the body.
Carbon dioxide and other toxic substances are formed in the cells as the end pr6ducts of combustion and other processes taking place in the cells. Carbon dioxide thus formed dissolves in the blood. When this impure blood carrying carbon dioxide reaches the lungs, carbon dioxide is released into the air present in tt1e lungs, and is exhaled with it.
Thus when we breathe in, oxygen of the air enters the lungs and dissolves in the blood. When we breathe out, carbon dioxide formed in the body is expelled. In short, the blood gets purified in the lungs. Even this elementary information is sufficient to make the importance of deep breathing obvious to everyone.
The main source of oxygen on the...
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