Structure of Lungs and Gas Exchange
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Questions and Answers

What is the purpose of the thin wall of the alveolus?

  • To increase the surface area for gas exchange (correct)
  • To regulate the pressure inside the alveolus
  • To filter out harmful particles from the air
  • To produce surfactant to reduce surface tension
  • Which of the following correctly describes the movement of gases during respiration?

  • Oxygen and carbon dioxide both diffuse from the alveolus to the blood
  • Oxygen diffuses from the alveolus to the blood, and carbon dioxide diffuses from the blood to the alveolus (correct)
  • Oxygen diffuses from the blood to the alveolus, and carbon dioxide diffuses from the alveolus to the blood
  • Oxygen and carbon dioxide both diffuse from the blood to the alveolus
  • What is the purpose of the film of moisture lining the inside of the alveolus?

  • To increase the surface tension of the alveolus
  • To facilitate the diffusion of gases across the alveolar wall (correct)
  • To trap harmful particles in the air
  • To produce surfactant to reduce surface tension
  • What is the purpose of the capillaries surrounding the alveoli?

    <p>To facilitate the exchange of gases between the air and the blood</p> Signup and view all the answers

    What is the primary cause of emphysema?

    <p>Smoking cigarettes</p> Signup and view all the answers

    What is the purpose of the artery that brings deoxygenated blood to the capillaries surrounding the alveoli?

    <p>To transport deoxygenated blood to the lungs for gas exchange</p> Signup and view all the answers

    What is the purpose of the film of moisture lining the inside of the alveolus?

    <p>To facilitate the diffusion of gases across the alveolar wall</p> Signup and view all the answers

    What is the purpose of the thin wall of the capillary surrounding the alveoli?

    <p>To facilitate the diffusion of gases across the capillary wall</p> Signup and view all the answers

    What is the purpose of the surfactant produced in the alveoli?

    <p>To reduce the surface tension of the alveoli and prevent them from collapsing</p> Signup and view all the answers

    What is the primary function of the alveoli in the respiratory system?

    <p>To facilitate the exchange of gases between the air and the blood</p> Signup and view all the answers

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