| http://www.w3.org/ns/prov#value | - The estimated 300 million alveoli (air sacs) in our lungs create a surface area of more than 100 square meters, where our blood receives fresh oxygen and releases carbon dioxide and other waste gases produced by our bodies.You can learn more about the lungs and respiratory system by clicking on the links below:The Respiratory SystemHow We BreatheThe Gas ExchangeThe LungsHow the Lungs Protect Thems
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