What is respiration??????
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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 mammals, physiological respiration involves respiratory cycles of inhaled and exhaled breaths.
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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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