Blood Vessels and Pulmonary Circulation Quiz
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Questions and Answers

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?

    <p>As a result of low pressures in the pulmonary circulation</p> Signup and view all the answers

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

    <p>Aorta</p> Signup and view all the answers

    What mainly triggers inspiration during the ventilation process?

    <p>Skeletal muscle contraction</p> Signup and view all the answers

    How does the caliber of alveolar vessels get determined?

    <p>By the relationship between alveolar pressure and the pressure within them</p> Signup and view all the answers

    What happens to pulmonary vascular resistance when cardiac output increases?

    <p>Falls due to capillary recruitment and distension</p> Signup and view all the answers

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

    <p>Hypoxic Pulmonary Vasoconstriction</p> 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?

    <p>70mmHg</p> Signup and view all the answers

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

    <p>Hypoxic Pulmonary Vasoconstriction</p> Signup and view all the answers

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

    <p>Blood flow stops completely</p> Signup and view all the answers

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