RESPIRATORY PHYSIOLOGY
Practice Questions: Pulmonary Circulation

PULMONARY CIRCULATION QUESTIONS

Indicate the best answer or completion.

1. When is the resistance to blood flow of the pulmonary vascular bed lowest?

A. When a person is at rest sitting up
B, When a person is at rest lying down
C. When a person is breathing air at high altitude
D. When a person is exercising maximally
E. None of the above because pulmonary vascular resistance is constant

2. Which of the following might be expected to lead to pulmonary edema?

A. decrease pulmonary arterial pressure (pulmonary hypotension)
B. decrease in systemic arterial pressure (systemic hypotension)
C. decrease volume of blood in the pulmonary circulation (as in hemorrhage)
D. increase systemic venous pressure (as in right heart failure)
E. increase pulmonary capillary permeability to plasma proteins (as in pulmonary inflammation)

3. In a person standing upright, which region of the lungs has the highest ventilation rate and which region has the highest circulatory perfusion rate?

A. highest ventilation: Apex; highest perfusion: Apex
B. highest ventilation: Apex; highest perfusion: Base
C. highest ventilation: Base; highest perfusion: Apex
D. highest ventilation: Base; highest perfusion: Base
E. there is no "highest" region as the apex and base have equal ventilation and perfusion rates