The lungs are less like balloons and more like giant warm marshmallows. They contain 1,000 miles of air-conducting tubes. The surface area of the tiny air sacs that make up the lungs is roughly the size of a tennis court. Here, Lon Kilgore, Ph.D., describes the anatomy of the lungs and explains how the respiratory system works to move oxygen from the atmosphere into the bloodstream.Read More
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30 single-leg squats, alternating
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