At what point does the trachea branch into two main stem bronchi?
a. Carina
b. Cricoid cartilage
c. Glottis
d. Manubrium
ANS: A
At the base of the trachea, the last cartilaginous ring that forms the bifurcation for the two bron-chi is called the carina. The carina is an important landmark that is used to identify the level at which the two main stem bronchi branch off from the trachea.
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