Respiratory System: Alveoli and Surface Tension
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Questions and Answers

What is the role of surface tension in the alveoli?

  • Assist in the absorption of nutrients in the alveoli
  • Cause the alveoli to expand indefinitely
  • Create a force to maintain the smallest possible shape (correct)
  • Decrease the elasticity of the alveoli

    • How does the recoil of the chest wall contribute to lung function?

  • Helps to keep the lungs open (correct)
  • Reduces the surface tension in the alveoli
  • Causes collapse of the alveoli
  • Increases pulmonary compliance

    • What is the function of pulmonary surfactant?

  • Reduces surface tension of alveoli (correct)
  • Increases elasticity of alveoli
  • Expands the chest wall
  • Promotes hysteresis in lung function

    • What happens to the forces at the end of inspiration in relation to the chest wall and lungs?

    <p>Outwards pull of chest wall is greater than inwards pull of lungs</p> Signup and view all the answers

    How does hysteresis affect lung function?

    <p>Is energy not recovered during expiration</p> Signup and view all the answers

    What effect does surfactant have on pulmonary compliance?

    <p>Increases pulmonary compliance</p> Signup and view all the answers

    What is the main purpose of pulmonary surfactant in the lungs?

    <p>Facilitate efficient gas exchange</p> Signup and view all the answers

    Which lung volume refers to the volume of air expelled with force expiration?

    <p>Expiratory reserve volume</p> Signup and view all the answers

    What determines the functional residual capacity (FRC) of the lungs?

    <p>Outward spring of the rib cage and inward elastic recoil of the lungs</p> Signup and view all the answers

    Which lung capacity is defined as the total volume of air from maximum inspiration to maximal expiration?

    <p>Vital capacity</p> Signup and view all the answers

    What is hysteresis a measure of in lung physiology?

    <p>Surface tension in the lungs</p> Signup and view all the answers

    Why is it important to understand the function of pulmonary surfactant?

    <p>To aid in efficient gas exchange</p> Signup and view all the answers

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