respiration. definition
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a process by which living thing produce energy from food respiration usually needs oxygen basically the meaning of respiration is breathing
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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. ... Ventilation refers to the in and out movement of air of the lungs and perfusion is the circulation of blood in the pulmonary capillaries.
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