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The diaphram is the muscle that allows us to breathe. The lungs are like a baloon that has been somehow sucked into a plastic bottle, inflating it inside the bottle. If a hole was made in the bottle, the lungs would collapse. Imagine the base of the bottle is replaced by a rubber membrane representing the diaphram, it would be sucked slightly into the bottle by the lower pressure. The diaphram tightens, which straightens it, expanding the volume in the bottle, and the lungs expand to fill that extra volume sucking in fresh air. The diaphram relaxes, gets sucked back upwards, reducing the volume, and the lungs expel the air.
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