Which of the following conditions must exist for gas to move between the alveolus and pulmo-nary capillary?
a. Adequate alveolar ventilation (VA)
b. Difference in partial pressures (pressure gradient)
c. Normal central nervous system (CNS) control mechanism
d. Sufficient amount of blood hemoglobin (Hb)
ANS: B
Diffusion is the process whereby gas molecules move from an area of high partial pressure to an area of low partial pressure.
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