The total length of the airways running through the two lungs is 1,500 miles or 2,400 kilometers.
The 300-500 million alveoli produce a combined surface area of 50-100 m2, a size roughly equivalent to a tennis court.
The relatively high oxygen content of air means we would only have to breathe once per minute to meet the body’s demand for oxygen at rest, the bulk of ventilatory work is for the elimination of carbon dioxide.
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