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Pulmonary Alveolus
Pulmonary alveolus (plural form: alveoli) is an integral component of the mammalian respiratory system, which of the following characteristics describes this component?
A. Actively transports O2 into the bloodstream.
B. Allows for gas diffusion to occur and the exchange of CO2 for O2 in the bloodstream.
C. Hollow cavities at the end of the respiratory tree.
D. B and C.
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