Test Your Knowledge on Thoracic Movements During Breathing
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Questions and Answers

During inspiration, which dimension of the thorax is increased primarily by the contraction and downward movement of the diaphragm?

  • Vertical diameter (correct)
  • Anteroposterior diameter
  • Transverse diameter
  • All of the above
  • Which dimension of the thorax is increased during inspiration by the raising of the ribs, especially the second through sixth ribs?

  • None of the above
  • Transverse diameter
  • Anteroposterior diameter (correct)
  • Vertical diameter
  • What causes the three diameters of the thorax to return to normal during expiration?

  • Contraction and downward movement of the diaphragm
  • None of the above
  • Swinging of the ribs outward and upward
  • Elastic recoil of the lungs, along with the weight of the thoracic walls (correct)
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