When the diaphragm contracts, it flattens and moves downwards, increasing the volume of the thoracic cavity. This decrease in pressure allows air to flow into the lungs, facilitating inhalation. In conjunction with the diaphragm, the intercostal muscles between the ribs also contract, lifting the rib cage upwards and outwards. This further expands the chest cavity, enhancing airflow into the lungs. Together, these actions play a crucial role in the process of breathing.
When the diaphragm contracts, the contract and lift the rib cage.
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