The trachea, also called the windpipe, is part of the passageway that supplies air to the lungs. Any prolonged blockage, even for a few minutes, can cause death. The trachea is about 4.5 inches long ...
Ciliary Streaming in the Bronchial Tree The flow of the ciliary stream in the bronchial tree of man is directed generally upward against gravity. Paradoxically, downstream is up toward the larynx, and ...
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