Based on the diagram shown here, which region of the pulmonary vasculature is characterized by the relationship among the pulmonary arterial, alveolar, and pulmonary venous pressures where Palveoli > Parterial > Pvenous?
A. lung apex
B. middle zone
C. lung base
D. This pressure relationship does not exist in the normal upright lungs.
?ANS: A
A. Correct response: The pressure relationship Palveoli > Parterial > Pvenous is located in the apical portion of the lung's pulmonary vasculature. The following pressure relationship occurs in the middle region of the pulmonary circulation: Parterial > Palveoli > Pvenous. The third possible relationship among these three pressures is found in the gravity dependent region (bases) of the upright lungs: Parterial > Pvenous > Palveoli.
B. Incorrect response: See explanation A.
C. Incorrect response: See explanation A.
D. Incorrect response: See explanation A.
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