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What is Breathing?

Q. What is breathing? Ans. Breathing is an external process, in this process inhale of air and exhale of air. Or  Breathing (or ventilation) is the process of moving air into and out of the lungs to facilitate gas exchange with the internal environment, mostly by bringing in oxygen and flushing out carbon dioxide.   Breathing is also known as external respiration. It is part of respiration but not internal or cellular respiration. The process of breathing does not fill the alveoli with atmospheric air during each inhalation (about 350 ml per breath), but the inhaled air is carefully diluted and thoroughly mixed with a large volume of gas (about 2.5 liters in adult humans) known as the functional residual capacity which remains in the lungs after each exhalation, and whose gaseous composition differs markedly from that of the ambient air . Physiological respiration involves the mechanisms that ensure that the composition of the fu
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What is Respiration?


Q. What is Respiration?




Definition:
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. Whole the process completed inside the cell. It is also known as "cellular respiration".

OR
 Oxidation of food with the help of inhaled oxygen and released energy is called Respiration, it always occurs at cellular level (inside the cell).
Respiration completed in two step:
i. Breathing (External Respiration): Inhale of air and exhale of air is called Breathing.
Breathing is not respiration, it is part of respiration. Without breathing respiration
cannot be done.

ii. Metabolism (internal Respiration) Cellular Respiration: It is the process which involves exchange of oxygen and carbon dioxide between the organisms and the environment. 
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