Thoracic Muscles: Anatomy and Function
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Questions and Answers

What happens to the volume of the thoracic cavity when the inspiratory muscles relax?

  • Increases
  • Vibrates
  • Stays the same
  • Decreases (correct)
  • According to Boyle’s law, what happens to the pressure within the lungs when lung volume decreases?

  • Fluctuates
  • Decreases
  • Increases (correct)
  • Stays the same
  • During passive expiration, why does air move out of the lungs?

  • Due to lung expansion
  • Due to increase in lung volume
  • Due to pressure gradient (correct)
  • Due to muscle contraction
  • Which muscles are primarily used during expiration when airway resistance is increased?

    <p>Internal intercostal muscles</p> Signup and view all the answers

    Which muscle compresses the abdominal cavity and helps push air out of the lungs?

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

    What is the primary function of extrinsic muscles related to respiration?

    <p>Movement of the pectoral girdle and/or arm</p> Signup and view all the answers

    Which muscle pulls the ribs downward and inward during expiration?

    <p>Internal intercostal muscles</p> Signup and view all the answers

    What happens to the lung-chest wall system after inspiration?

    <p>It returns to its resting position</p> Signup and view all the answers

    What do extrinsic muscles have one attachment to?

    <p>Thoracic cage</p> Signup and view all the answers

    Which muscle helps in movement of the rib cage for respiration?

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

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