Pulmonary Blood Flow Zones
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Questions and Answers

What occurs when the lung alveolar air pressure exceeds the capillary blood pressure?

  • The capillaries remain unchanged, maintaining blood flow
  • The capillaries rupture, causing hemorrhage
  • The capillaries close, stopping blood flow (correct)
  • The capillaries dilate, increasing blood flow

    • In which zone of pulmonary blood flow is there no blood flow during any part of the cardiac cycle?

  • Zone 3
  • Zone 4
  • Zone 1 (correct)
  • Zone 2

    • What is the characteristic of blood flow in Zone 2 of the lungs?

  • Intermittent blood flow during peaks of pulmonary arterial pressure (correct)
  • No blood flow during the entire cardiac cycle
  • Continuous blood flow throughout the cardiac cycle
  • Reversed blood flow during diastole

    • What is the typical pattern of pulmonary blood flow in a normal lung?

    <p>Both Zone 2 and Zone 3 blood flow</p> Signup and view all the answers

    What is the determining factor for the flow of blood in the lungs?

    <p>The difference between alveolar air pressure and capillary blood pressure</p> Signup and view all the answers

    In which zone of the lung is the blood flow continuous throughout the cardiac cycle?

    <p>Zone 3</p> Signup and view all the answers

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