Alveolar Gas Exchange Process
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Questions and Answers

What condition leads to an imbalance between ventilation rate and blood flow through the pulmonary circuit?

  • Pulmonary bronchitis
  • COPD
  • Pulmonary embolism (correct)
  • Hypoxic pulmonary vasoconstriction
  • Where does a low V̇/Q̇ ratio naturally occur in the lungs?

  • Middle lobe of the lung
  • Apex of the lung
  • Base of the lung (correct)
  • Hilum of the lung
  • In which condition do the airways become stenosed or occluded, leading to a low V̇/Q̇ ratio?

  • Pulmonary hypertension
  • Pulmonary embolism
  • Asthma (correct)
  • Pulmonary edema
  • Which factor leads to hypoxic pulmonary vasoconstriction, resulting in pulmonary hypertension?

    <p>High PAO2 or low PACO2 in the alveolus</p> Signup and view all the answers

    What is the main form of CO2 transport in blood involving bicarbonate anions?

    <p>Dissolved in plasma and RBCs</p> Signup and view all the answers

    Which factor affects oxygen saturation by binding to hemoglobin much more strongly than oxygen?

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

    What happens to carboxyhemoglobin when the partial pressure of oxygen in the alveoli is increased?

    <p>Dissociates into CO2 and H+</p> Signup and view all the answers

    What is the form of hemoglobin that has a much higher affinity for oxygen than adult hemoglobin?

    <p>(F) Fetal Hemoglobin</p> Signup and view all the answers

    'V̇' in V̇/Q̇ ratio refers to:

    <p>'Ventilation' rate</p> Signup and view all the answers

    'Q̇' in V̇/Q̇ ratio stands for:

    <p>'Perfusion' rate</p> Signup and view all the answers

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