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Changes in the Partial Pressures of Oxygen and Carbon Dioxide

View the animation below, then complete the quiz to test your knowledge of the concept.






1At the arterial ends of the pulmonary capillaries...
A)the Po2 is higher in the capillaries than in the alveoli.
B)the Po2 is lower in the capillaries than in the alveoli.
C)the Po2 is equal in the capillaries and in the alveoli.
D)the Po2 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 Po2 is lower at first in the capillaries than in the alveoli, and then it is higher in the alveoli than in the capillaries.



2At 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.



3The ranking from highest to lowest Po2 in the area of the arterial ends of the tissue capillaries is...
A)capillaries, tissue fluid, cells.
B)cells, tissue fluid, capillaries.
C)cells, capillaries, tissue fluid.
D)tissue fluid, capillaries, cells.
E)all three are equal.



4When partial pressures for a given gas are equal between the capillaries and the tissue fluids, no net movement of that gas occurs.
A)True
B)False



5Gasses diffuse because of differences in partial pressures from areas of higher pressure to areas of lower pressure.
A)True
B)False







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