The nurse is providing health education on the body's ability to exchange oxygen and carbon dioxide through the alveolar capillary membrane. Which statement, provided by the nurse, is most correct when asked about diffusion during inspiration?
A) During inspiration, the concentration of oxygen is equal in both the alveoli and the capillaries.
B) During inspiration, oxygen diffuses from the arterial system through to the alveolar capillary membrane.
C) During inspiration, carbon dioxide provides the basis for all diffusion gradients.
D) During inspiration, oxygen is greater in the alveoli than in the capillaries.
D
Feedback:
During inspiration, oxygen-rich air from the environment enters the pulmonary system. During inspiration, the concentration of inspired oxygen is higher in the alveoli than in the capillaries, causing diffusion from the alveoli to the capillaries. Thus, the concentration of oxygen is not equal in the alveoli and capillaries. There is no diffusion from the arterial system after the oxygen diffuses from the alveoli to the capillaries. Carbon dioxide does not provide the basis for all diffusion gradients.
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