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The diaphragm must contract to a flattened position beneath your lungs. At the same time, the intercostal muscles between your ribs must also contract. These two features enable air to be sucked down into your lungs, which can then expand.

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15y ago
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11y ago

Lungs, apart of the Respitory system inhale part of what is in the air, it inhales oxygen mainly because the blood needs it.

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10y ago

to breathe you need working lungs.

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Q: What is needed for breathing to occur?
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