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Which of the following causes increase in the volume of the thoracic cavity during inspiration?

Which of the following causes increase in the volume of the thoracic cavity during inspiration? Correct Answer Both 1 & 2

  • The volume of the thoracic cavity is dependent on the contraction and relaxation of the diaphragm. During the inhalation, the volume of the thoracic cavity is required to be increased.
  • For this, the diaphragm contracts and pushes against the abdomen cavity. The intercostal muscles present between the rib bones also contracts and this allows outward movement of the bones.
  • As a result, the lungs can expand in order to create a low-pressure area. Because of this, the air is drawn in.

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