(Science: anatomy chest medicine) Any of the larger air passages of the lungs, having an outer fibrous coat with irregularly placed plates of hyaline cartilage, an interlacing network of smooth muscle and a mucous membrane of columnar ciliated epithelial cells.
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For number 2: pneumomediastinum Ruptured bronchus or alveoli in the lungs from excessive pressure. May be caused by holding breath while ascending. lung expansion injury It can be caused by holding breath while ascending. Basically if you hold ...
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