The thoracic cavity increases in volume prima | vedclass

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(B) The process of breathing involves the movement of air into and out of the lungs,which is driven by pressure gradients created by the thoracic cavi

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Diaphragm

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(B) The process of breathing involves the movement of air into and out of the lungs,which is driven by pressure gradients created by the thoracic cavity. $1$. The thoracic cavity is an airtight chamber. $2$. The diaphragm is a dome-shaped muscular partition that separates the thorax from the abdomen. $3$. During inspiration,the contraction of the diaphragm muscle flattens it,which increases the volume of the thoracic cavity in the antero-posterior axis. $4$. This increase in volume leads to a decrease in pressure within the lungs,causing air to flow in. $5$. While external intercostal muscles also assist by lifting the ribs and sternum,the primary increase in thoracic volume is attributed to the contraction of the diaphragm.

The thoracic cavity increases in volume primarily due to the contraction of which of the following?

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