The exchange of gases between the air spaces (alveoli)of the lungs and the blood in pulmonary capillaries, where the blood gains O₂ and loses CO₂, is called A)internal respiration B)osmosis C)external respiration D)homeostasis E)buoyancy ventilation

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External respiration refers to the exchange of gases (oxygen and carbon dioxide) between the alveoli of the lungs and the blood in pulmonary capillaries. This process is necessary for proper oxygenation of the blood and removal of carbon dioxide from the body. Internal respiration, on the other hand, refers to the exchange of gases between the blood and body tissues. Osmosis is the movement of water molecules across a selectively permeable membrane, not the exchange of gases. Homeostasis refers to the maintenance of a stable internal environment in the body, while buoyancy ventilation is not a term used in respiratory physiology.

The Exchange of Gases Between the Air Spaces (Alveoli)of the Lungs