Runner Things #595
Posted on 22 Dec, 2011
Reasons to be fit #0673 So when you're 60 and all your friends have to get hip replacements, you're still going strong.
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The surface area of a human lung is equal to a tennis court. To more efficiently oxygenate the blood, the lungs are filled with thousands of branching bronchi and tiny, grape-like alveoli and microscopic capillaries to keep you properly oxygenated.
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