8 Interesting Facts About Our Lungs

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4. What do lungs and a tennis court have in common? Their size! It seems pretty impossible, but if the lungs were opened flat, they would be so big that they would cover the size of a tennis court!

5. Oxygen only plays a small part in breathing.  The air we breathe contains 21 percent oxygen, but our bodies only use 5 percent—the rest is exhaled.

6. Seventy percent of waste is eliminated through your lungs just by breathing.

Learn more about how researchers are looking into whether Tai Chi improves breathing for people with cystic fibrosis.

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