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Q What change occurs during inspiration?

ID: #10022 Respiratory system 138 views
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#10022Q ID
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Respiratory systemTopic
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  • A Increase in thoracic cavity ✔ ✖
  • B Relaxation in diaphragm ✔ ✖
  • C Relaxation in external intercostal muscles ✔ ✖
  • D Sternum moves towards ventral and anterior direction ✔ ✖
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During inspiration, the thoracic cavity volume increases. This is due to the contraction of the diaphragm and the external intercostal muscles, which move the ribs upward and outward. In addition, the sternum moves towards the ventral and anterior direction. This movement of the sternum is known as the pump-handle movement and it increases the anterior-posterior dimension of the thoracic cavity, allowing more air to be drawn into the lungs.

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