At the Venous Ends of the Pulmonary Capillaries

Multiple Choice

At the venous ends of the pulmonary capillaries...

A) the Pco2 is higher in the capillaries than in the alveoli.
B) the Pco2 is lower in the capillaries than in the alveoli.
C) the Pco2 is equal in the capillaries and in the alveoli.
D) the Pco2 is higher at first in the capillaries than in the alveoli, and then it is lower in the alveoli than in the capillaries.
E) the Pco2 is lower at first in the capillaries than in the alveoli, and then it is higher in the alveoli than in the capillaries.