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Contraction of the diaphragm reduces space in the rib cage and forces gases out of the lungs. As the diaphragm relaxes it increases the cavity size in the chest causing a drop in pressure, the decrease in pressure draws air in through the mouth or nose into the lungs. :)

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15y ago

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What is a passive process that moves air out of the lungs?

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Is the respiratory system is the system that moves oxygen into your body and takes carbon dioxide and water out?

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