Respiratory System Muscles and Passive Expiration Quiz

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Questions and Answers

Which muscles are involved in passive expiration?

  • Greater and small chest scalenes and sterno-cleido-mastoids
  • Internal intercostal muscle and abdominal muscles of the forward wall (correct)
  • External intercostal muscle and diaphragm
  • Lifted thorax elastic resistance and pressure organs of a belly cavity

What is the role of alveolar surfactant?

  • Interferes with an atelectasis
  • Possesses bacteriostatic effect
  • Regulates speed of blood flow in lungs
  • Decreases surface tension during expiration (correct)

What factors lead to passive expiration?

  • Lifted thorax elastic resistance and elastic resistance of costal cartilages of a thorax (correct)
  • Pressure organs of a belly cavity and external intercostal muscle the diaphragm
  • Surfactant and water pairs the gas
  • Contraction of abdominal muscles of a wall and peristaltic contractions of the small intestine

Which muscles are involved in active expiration?

<p>Internal intercostal muscle and abdominal muscles of the forward wall (D)</p> Signup and view all the answers

What does the surface tension in lungs regulate?

<p>Surfactant (C)</p> Signup and view all the answers

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