The main air passages that branch from the trachea into the left and right lungs, then subdivide into smaller branches. They conduct air to and from the lungs and are lined with ciliated epithelium that helps clear debris.
From Greek 'bronchos' meaning windpipe or throat. The plural form 'bronchi' refers to the branching tree-like structure that resembles the branches of a tree.
Your bronchi are like an upside-down tree with 23 levels of branching! The entire bronchial tree has about 300 million tiny air sacs at the end, and if you could spread them flat, they'd cover a tennis court.
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