Respiratory System

1. We breathe 13 pints of air every minute.
2. Each lung contains 300-350 million respiratory units called alveoli making it a total of 700 million in both lungs.
3. More than half a liter of water per day is lost through breathing.
4. People under 30 years of age take in double the amount of oxygen in comparison to a 80 year old.
5. Yawning brings more oxygen to the lungs.

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