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trachea
The—- is fairly rigid because its walls are reinforced with C-shaped rings of hyaline cartilage.
cilia
The trachea is lined with —- that beat continuously and in a direction opposite to that of the incoming air as they propel mucus, loaded with dust particles and other debris away from the lungs to the throat, where it can be swallowed or spat out.
main bronchi
are formed by the division of the trachea.
right main bronchus
is wider, shorter, and straighter than the left.