Respiratory System Pleural Pressure Quiz
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Questions and Answers

What is the normal pleural pressure when respiratory muscles are completely relaxed and airways are open?

  • 0 mm Hg
  • -2.5 mm Hg (correct)
  • -10 mm Hg
  • -6 mm Hg

    • What happens to the pleural pressure during inspiration due to chest wall expansion?

  • Becomes more negative (correct)
  • Remains at -2.5 mm Hg
  • Becomes more positive
  • Balances out

    • What is the clinical significance of intrapleural pressure becoming equal to atmospheric pressure?

  • Chest wall expands
  • Pneumothorax occurs (correct)
  • Breathing becomes easier
  • Lungs expand

    • What is transpulmonary pressure defined as?

    <p>Difference between alveolar pressure and atmospheric pressure</p> Signup and view all the answers

    During expiration, what causes the decrease in alveolar pressure?

    <p>Increase in intrathoracic volume</p> Signup and view all the answers

    What results from the elastic recoil of the lungs compressing the air in the alveoli?

    <p>Increased lung volume</p> Signup and view all the answers

    What is the main muscle responsible for inspiration?

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

    During inspiration, what happens to the intrapleural pressure?

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

    Which muscle is involved in increasing the lateral and anterio-posterior diameters of the thoracic cage during inspiration?

    <p>External intercostal muscles</p> Signup and view all the answers

    What defines transpulmonary pressure?

    <p>Pressure difference between alveolar pressure and intrapleural pressure</p> Signup and view all the answers

    Which factor plays a significant role in changing the compliance of the lungs?

    <p>Elasticity of lung tissue</p> Signup and view all the answers

    In which phase of respiration would one typically observe a decrease in pleural pressure?

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

    What is the role of the abdominal muscles in expiration?

    <p>Compress the abdominal cavity and push the diaphragm up</p> Signup and view all the answers

    How does intrapleural pressure relate to pleural pressure?

    <p>Intrapleural pressure is the pressure of fluid between the visceral and parietal pleura</p> Signup and view all the answers

    What causes intrapulmonary pressure to decrease during inspiration in quiet breathing?

    <p>Elastic recoil of the lungs</p> Signup and view all the answers

    How does intrapulmonary pressure change during expiration in quiet breathing?

    <p>Swings slightly to the positive side (+1 mm Hg)</p> Signup and view all the answers

    What is transpulmonary pressure?

    <p>Pressure difference between intrapulmonary and intrapleural pressure</p> Signup and view all the answers

    In quiet breathing, what is the significance of intrapulmonary pressure reaching 0 mm Hg at end-inspiration?

    <p>It allows about 500 mL of air to be sucked into the lungs</p> Signup and view all the answers

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