Respiratory Quiz #11, Pulmonary Vasculature and Physiology  

1. A 23-year-old male presents to the clinic with shortness of breath and a recent history of deep vein thrombosis. A ventilation-perfusion (V/Q) scan indicates multiple areas of decreased perfusion with normal ventilation. Which of the following is the most likely diagnosis? 

Question 1 of 5

2. A 55-year-old woman with a history of congestive heart failure is brought to the emergency department with dyspnea and cough. A chest X-ray shows engorged pulmonary veins and Kerley B lines. Which of the following mechanisms best explains her pulmonary symptoms? 

Question 2 of 5

3. During a physiology lecture, a medical student learns that certain areas of the lung are better ventilated and perfused than others due to gravity. Which zone of the lung has the highest ventilation-perfusion ratio (V/Q ratio)? 

Question 3 of 5

4. A 68-year-old man with chronic obstructive pulmonary disease (COPD) presents with cyanosis and polycythemia. Which of the following adaptations is most likely responsible for his polycythemia?

Question 4 of 5

5. A patient with primary pulmonary hypertension is found to have a markedly increased mean pulmonary artery pressure on right heart catheterization. Which of the following changes is most likely to occur in the pulmonary vasculature due to sustained pulmonary hypertension?

Question 5 of 5


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