Systemic gas exchange refers to the

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transport of gases by the blood

diffusion of O₂ and CO₂ across the alveolar membrane

drawing of atmospheric air into the lungs and expulsion of alveolar air

diffusion of O₂ and CO₂ between blood and tissues

answer is D.

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Detailed Solution

Systemic gas exchange, or internal respiration refers to the exchange of gases (O₂ and CO₂) between blood and systemic tissue. Exchange of gases between the alveolar air and the blood in pulmonary capillaries is termed pulmonary gas exchange, or external respiration.

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