What occurs to the volume of the thoracic cavity during expiration?

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During expiration, the volume of the thoracic cavity decreases. This process is primarily facilitated by the relaxation of the diaphragm and intercostal muscles. When these muscles relax, the diaphragm moves upward and the rib cage descends, leading to a reduction in the volume of the thoracic cavity. As a result, the pressure inside the thoracic cavity increases, which forces air out of the lungs and into the atmosphere. This decrease in volume is essential for expelling carbon dioxide-rich air from the lungs effectively, allowing for proper gas exchange and maintaining respiratory function.

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