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A 70-year-old African-American man with a 50-pack-year history of smoking comes in complaining of shortness of breath. While sitting, the patient is leaning forward and breathing with his lips pursed. Auscultation of his lungs reveals decreased breath sounds. Which of the following statements describes the type of gas exchange occurring in his condition?



A. It is illustrated by CO and O2 under healthy, resting conditions
B. It is illustrated by N2O and CO2 concentrations in the blood during strenuous exercise and at rest
C. It is only increased by an increase in blood flow
D. It is present when there is a decreased surface area for gas exchange
E. It is when oxygen equilibrates early along the length of the pulmonary capillary
F. It is when the gas partial pressure of alveolar air and pulmonary capillary blood equalizes
Asked by Christopher, Last updated: Dec 18, 2019

This question is part of

USMLE full length exam prt 11 of 14

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1 Answer

John Smith

John Smith

Answered Sep 09, 2016

It is present when there is a decreased surface area for gas exchange-the correct answer is d. emphysema is an obstructive lung disease in which alveoli are destroyed. this decreases surface area...Read More
 

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