Respiratory System: Alveoli and Pulmonary Circulation
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Questions and Answers

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

  • Site of gas exchange (correct)
  • Produce mucus to trap pathogens
  • Warm the inhaled air
  • Generate oxygen for the body

    • Which statement accurately describes pulmonary circulation?

  • It has the same pressure as the systemic circuit
  • Blood flow rate is low due to high resistance
  • It contains a large proportion of the total blood volume (correct)
  • Pressure in the circuit is primarily due to high resistance

    • How does airflow occur according to Boyle's Law during inspiration?

  • Lung pressure decreases below atmospheric pressure (correct)
  • Lung volume decreases causing atmospheric air to move out
  • Atmospheric pressure increases within the lungs
  • The alveoli shrink to draw air in from the atmosphere

    • What percentage of atmospheric air is composed of oxygen?

    <p>21%</p> Signup and view all the answers

    What determines the flow of air according to gas laws?

    <p>Pressure gradient</p> Signup and view all the answers

    Which factor contributes to the high surface area of alveoli for optimal gas exchange?

    <p>Heavily vascularized nature</p> Signup and view all the answers

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