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respiration
(res″pĭ-ra´shәn)
the exchange of oxygen and carbon dioxide between the atmosphere and the body cells, including inhalation and exhalation, diffusion of oxygen from the pulmonary alveoli to the blood and of carbon dioxide from the blood to the alveoli, followed by the transport
of oxygen to and carbon dioxide from the body cells. See also ventilation (def. 2).
the metabolic processes by which living cells break down carbohydrates, amino acids, and fats to produce energy in the form of adenosine triphosphate (ATP); called also cell respiration.
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