Physics of Breathing Quiz
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Questions and Answers

During inspiration (inhalation), what happens to the thoracic cavity volume?

  • Decreases
  • Stays the same
  • Becomes negative
  • Increases (correct)
  • What controls the process of breathing (ventilation) according to Boyle's Law?

  • Product of absolute pressure and volume (correct)
  • Changes in lung volume
  • Pressure gradients in the lungs
  • Atmospheric pressure
  • What happens to the pressure inside the thoracic cavity during inspiration?

  • Stays the same
  • Becomes zero
  • Decreases (correct)
  • Increases
  • In what condition would you expect the ratio of poor ventilation to good perfusion to be less than 0.8?

    <p>Lung infection like pneumonia</p> Signup and view all the answers

    Which muscle contracts during inspiration causing an increase in thoracic cavity volume?

    <p>Intercostal muscles</p> Signup and view all the answers

    How is gas exchange in the lungs facilitated?

    <p>By diffusion across alveolar membranes</p> Signup and view all the answers

    Which part of the airways is responsible for transporting, warming, humidifying, and filtering air?

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

    Where does gaseous exchange primarily occur in the lungs?

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

    Which structure is NOT part of the conducting zone of the airways?

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

    What is the primary function of alveolar sacs in the lungs?

    <p>Allow gaseous exchange</p> Signup and view all the answers

    Which step in the exchange of gases involves movement of air into and out of the lungs?

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

    In which structure do we find blood-air gas exchange in the lungs?

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

    What does the Ventilation-Perfusion (V/Q) ratio measure?

    <p>Amount of air entering the alveoli</p> Signup and view all the answers

    What is the consequence of a V/Q ratio of zero?

    <p>No air exchange</p> Signup and view all the answers

    In the lungs, what does 'Perfusion (Q)' refer to?

    <p>Flow of blood that reaches the alveoli</p> Signup and view all the answers

    What happens if there is good ventilation but poor perfusion in the lungs?

    <p>V/Q ratio becomes infinite</p> Signup and view all the answers

    What is the significance of a V/Q ratio different from 0.8 in the lungs?

    <p>Indicates no gas exchange</p> Signup and view all the answers

    How does a V/Q ratio > 0.8 impact gas exchange in the lungs?

    <p>Worsens gas exchange efficiency</p> Signup and view all the answers

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