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The trachea and bronchi have a protective function due to:

a.

the Clara cells have metabolizing enzymes
b.

mucous traps particles and then you swallow it
c.

mucous accumulates in the trachea and you cough it up
d.

both A and B are true

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Patrina Schowalter
Patrina SchowalterLv2
28 Sep 2019

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