bronchus(redirected from Left mainstem bronchi)
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elastic organs used for breathing in vertebrate animals, excluding most fish, which use gills, and a few amphibian species that respire through the skin. The word is sometimes applied to the respiratory apparatus of lower animals.
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Either of the two primary branches of the trachea or any of the bronchi's pulmonary branches having cartilage in their walls.
either of the two main branches of the trachea, which contain cartilage within their walls