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respiration

movement of oxygen from the outside air to the cells within tissues, and the transport of carbon dioxide in the opposite direction

AI overview

Respiration is the process where your body moves oxygen from the air you breathe into your cells, and then removes the waste product carbon dioxide by sending it back out. This matters because your cells need oxygen to function, and getting rid of carbon dioxide prevents harmful buildup in your body.

AI-generated from the Wikipedia summary — may contain errors.

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Commons category: Respiration
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Article

In physiology, respiration is a process that facilitates the transport of oxygen from the outside environment to bodily tissues and the removal of carbon dioxide using a respiratory system.

The physiological definition of respiration differs from the biological definition of cellular respiration, which is a metabolic process by which an organism obtains energy (in the form of ATP and NADPH) by oxidizing nutrients and releasing waste products. Although physiologic respiration is necessary to sustain cellular respiration and thus life in animals, the processes are distinct: cellular respiration takes place in individual cells of the organism, while physiologic respiration concerns the diffusion and transport of metabolites between the organism and the external environment.