Lung ventilation movements are due to

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(A) The ventilation of the lungs (breathing) is primarily driven by changes in the volume of the thoracic cavity.This process is facilitated by the co

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Costal muscles and diaphragm

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(A) The ventilation of the lungs (breathing) is primarily driven by changes in the volume of the thoracic cavity.This process is facilitated by the contraction and relaxation of the diaphragm and the external and internal intercostal muscles (costal muscles).The diaphragm moves downward during inspiration to increase the thoracic volume,while the costal muscles move the ribs and sternum to further expand the thoracic cavity.Therefore,both the diaphragm and costal muscles are essential for lung ventilation.

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