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Questions and Answers

Which of the following structures collectively comprise the terminal respiratory unit (TRU)?

  • Larynx, pharynx, and trachea
  • Alveoli, bronchioles, and pulmonary capillaries
  • Trachea, bronchi, and bronchioles
  • Respiratory bronchioles, alveolar ducts, and alveolar sacs (correct)
  • What is the site of gas exchange with the pulmonary capillary blood?

  • Pulmonary capillaries
  • Alveoli (correct)
  • Respiratory bronchioles
  • Alveolar ducts
  • What can stimulate the smooth muscle present in respiratory bronchioles and alveolar ducts?

  • Oxygen in the pulmonary blood
  • Hormones in the pulmonary blood
  • Carbon dioxide in the pulmonary blood
  • Vasoactive substances in the pulmonary blood (correct)
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