Trachea and lungs
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“The trachea has in its walls stiff rings of cartilage that hold it open so that the air can pass freely through it to and from the lungs. At its base the trachea divides and sends a great branch to each lung.” — Ritchie, 1918
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Human Lower Respiratory SystemSource
John W. Ritchie Primer of Physiology (New York: World Book Company, 1918) 55
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