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Changes in the Partial Pressures of Oxygen and Carbon Dioxide (Quiz 2)

Why are separate arteries and veins more efficient for gas transport? In vertebrates gases are carried through body in two sets of blood vessels. Arteries carry blood away from the heart while veins carry blood towards the heart. There are two reasons for having separate sets of blood vessels. First maintaining a high rate of flow would be much more challenging if blood had to flow in opposite directions in the same vessels. Second, if oxygenated and deoxygenated blood mix then the gas concentration in the blood will tend to reach an equilibrium at an intermediate concentration. The equilibrium would result in lower concentration differences between blood and cells and between blood and the air, resulting in reduced rates of gas transport.

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






1The direction of gas movement is determined by
A)temperature.
B)size of the gas molecule.
C)solubility of the gas in blood.
D)partial pressure differences.
E)pH.



2At the arterial end of the pulmonary capillaries,
A)O2 diffuses from the alveoli into the blood, while CO2 diffuses from the blood into the alveoli.
B)O2 diffuses from the blood into the alveoli, while CO2 diffuses from the alveoli into the blood.
C)both O2 and CO2 diffuse from the blood into the alveoli.
D)both O2 and CO2 diffuse from the alveoli into the blood.
E)O2 diffuses from the alveoli into the blood, but there is no net movement of CO2.



3At the arterial end of the tissue capillaries,
A)O2 diffuses from tissue cells into the blood, while CO2 diffuses from the blood into tissue cells.
B)O2 diffuses from the blood into tissue cells, while CO2 diffuses from tissue cells into the blood.
C)both O2 and CO2 diffuse from the blood into tissue cells.
D)both O2 and CO2 diffuse from tissue cells into the blood.
E)O2 diffuses from the blood into tissue cells, but there is no net movement of CO2.



4The partial pressure of a gas is measured in millimeters of mercury.
A)True
B)False



5At the venous end of tissue capillaries, there is no net movement of O2 and CO2.
A)True
B)False







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