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During inhalation, the diaphragm contracts and moves downward, while the intercostal muscles between the ribs contract, causing the ribcage to expand. This increases the volume of the chest cavity, creating a pressure difference that allows air to flow into the lungs. During exhalation, the diaphragm and intercostal muscles relax, causing the chest cavity to decrease in volume and air to be pushed out of the lungs.

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1y ago

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