Breathing Process: Exhalation
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Questions and Answers

What is the result of a decrease in intrapleural pressure?

  • Decrease in tidal volume
  • Increase in intrapulmonary pressure
  • Expansion of the lungs (correct)
  • Contraction of the diaphragm

    • What is the primary function of the quadratus lumborum and serratus posterior inferior muscles during forced inspiration?

  • Help rib elevation
  • Prevent inward movement of the lower ribs (correct)
  • Elevate the upper ribs
  • Contract the diaphragm

    • What percentage of pulmonary ventilation is accounted for by abdominal breathing during eupnea?

  • 90%
  • 50%
  • 25%
  • 75% (correct)

    • What occurs during eupnea expiration?

    <p>Passive process with no muscle activity</p> Signup and view all the answers

    What is the term for breathing produced by contraction of the external intercostal muscles?

    <p>Costal or thoracic breathing</p> Signup and view all the answers

    What is the tidal volume that enters the lungs during normal resting breathing?

    <p>500 ml</p> Signup and view all the answers

    What is the role of the sternomastoid and scaleni muscles during forced inspiration?

    <p>Elevate the upper ribs</p> Signup and view all the answers

    What is the change in intrapulmonary pressure during normal resting breathing?

    <p>Decrease from 0 to -1 mmHg</p> Signup and view all the answers

    What is the primary inspiratory muscle that contracts during eupnea?

    <p>Diaphragm</p> Signup and view all the answers

    What is the term for breathing produced by contraction of the diaphragm?

    <p>Abdominal breathing</p> Signup and view all the answers

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