Blood Vessels and Pulmonary Circulation Quiz

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What is the normal mean pressure in the human pulmonary artery?

8 mm Hg

20 cm of water

15 mm Hg (correct)

25 mm Hg

What is the normal value for Normal Dlco?

15 ml/min/mmHg

30 ml/min/mmHg

25 ml/min/mmHg (correct)

0 ml/min/mmHg

How long does each red blood cell spend in the capillary network for complete equilibration of oxygen and carbon dioxide?

1 sec

2 sec (correct)

3 sec

4 sec

Why are the walls of pulmonary arteries remarkably thin?

As a result of low pressures in the pulmonary circulation Signup and view all the answers

What is the primary source of blood supply to the conducting airways up to the terminal bronchioles?

Aorta Signup and view all the answers

What mainly triggers inspiration during the ventilation process?

Skeletal muscle contraction Signup and view all the answers

How does the caliber of alveolar vessels get determined?

By the relationship between alveolar pressure and the pressure within them Signup and view all the answers

What happens to pulmonary vascular resistance when cardiac output increases?

Falls due to capillary recruitment and distension Signup and view all the answers

What is the primary mechanism that helps optimize gas exchange by decreasing blood flow to poorly oxygenated alveoli?

Hypoxic Pulmonary Vasoconstriction Signup and view all the answers

If alveolar PO2 drops below what level, vasoconstriction may occur as part of the active control of the pulmonary circulation?

70mmHg Signup and view all the answers

What process involves optimizing gas exchange by decreasing blood flow to poorly oxygenated alveoli?

Hypoxic Pulmonary Vasoconstriction Signup and view all the answers

What happens to blood flow in poorly oxygenated alveoli when the alveolar PO2 is very low?

Blood flow stops completely Signup and view all the answers

Blood Vessels and Pulmonary Circulation Quiz

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Questions and Answers

What is the normal mean pressure in the human pulmonary artery?

What is the normal value for Normal Dlco?

How long does each red blood cell spend in the capillary network for complete equilibration of oxygen and carbon dioxide?

Why are the walls of pulmonary arteries remarkably thin?

What is the primary source of blood supply to the conducting airways up to the terminal bronchioles?

What mainly triggers inspiration during the ventilation process?

How does the caliber of alveolar vessels get determined?

What happens to pulmonary vascular resistance when cardiac output increases?

What is the primary mechanism that helps optimize gas exchange by decreasing blood flow to poorly oxygenated alveoli?

If alveolar PO2 drops below what level, vasoconstriction may occur as part of the active control of the pulmonary circulation?

What process involves optimizing gas exchange by decreasing blood flow to poorly oxygenated alveoli?

What happens to blood flow in poorly oxygenated alveoli when the alveolar PO2 is very low?

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