TRACHEA, BRONCHI AND BRONCHIOLES

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-Tracea and bronchi

-have similar structure

-but the bronchi is narrower

-than the trachea

-They have relatively thick walls

-that have several layers of tissue

-Much of the wall

-sonsists of cartilage

-The cartilage is in the form of incomplete rings

-or C-rings in in the trachea

-but is less regular in the bronchi

-On the inside surface

-of the cartilage

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