单项选择题

The process by which carbon dioxide and oxygen are transferred does not depend on ______.

A．the presence of nitrogen in the blood
B．the muscles of the thoracic cavity
C．the flow of blood
D．the moisture in the air sac linings
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单项选择题
While air is in the lungs, it changes in the following way: ______.
A．Nitrogen is absorbed from the air
B．About one-fifth of the carbon dioxide and about one-half of the oxygen in the air goes into the blood
C．The moisture in the air is almost completely evaporated
D．About one-fifth of the oxygen in the air goes into the blood and an equivalent amount of carbon dioxide enters the air from the blood
单项选择题
In the respiratory process, the following action takes place: ______.
A．Diffusion of blood through capillary walls into air sacs
B．Exchange of alveoli and oxygen within air sacs
C．Diffusion of oxygen through the air sac and capillary walls into the blood
D．None of the above
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