The process of inspiration occurs when the intercostal muscles receive nerve impulses that causes them and the diaphragm to contract. The diaphragm goes down and increases the size of the thoracic cavity. The lung inflates because the thoracic cavity and the lungs are attached. The lungs deflate when the diaphragm relaxes and goes back up into its original position. The volume of the thoracic cavity decreases and this compresses the lungs. The process of the diaphragm contracting only happens during inspiration.
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