• The primary, secondary, and tertiary bronchi are lined with ciliated mucous membranes and are reinforced with cartilage to keep them from collapsing. Why?
Added by Colleen R.
Step 1
The cilia, which are tiny hair-like structures, beat in a coordinated manner to propel the mucus (which contains trapped particles) upwards towards the throat, where it can be either swallowed or expectorated. Show more…
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