17. How does the body defend
itself from microorganisms
and other harmful substances
that enter the airway during
the breathing process?

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The epithelium of airway is a
epithelium and has -secreting
specialized cells. The mucus
covers the wall of the
retaining organisms and
particles that then swept by the
of the epithelium.

the mucous ciliated of the
airway is also intense of
the immune with antibodies and
inactivating and destroying
agents.

Other defense of the
airway the sneeze and cough.
They help elimination of solid
semi fluid particles pathologic
residuals (sputum) accidentally
aspired objects.