Q.

Systemic gas exchange refers to the

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a

transport of gases by the blood

b

diffusion of O2 and CO2 across the alveolar membrane

c

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

d

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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