Question

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what is respiration?

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Answer 1

Answer:

In physiology, respiration is the movement of oxygen from the outside environment to the cells within tissues, and the removal of carbon dioxide in the opposite direction. ... In contrast, exhalation (breathing out) is usually a passive process.

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Answer 2

Answer:

respiration is the movement of oxygen from outside environment to the shell of tissue and the removal of carbon dioxide in the opposite direction