38
UNIT 2
Basic Tissues
Figure 3-10.
Respiratory epithelium, example of ciliated pseudostrati±
ed columnar epithelium.
EM,
3
6,300; inset
3
11,500
This view of the respiratory epithelium includes only the apical half of the thickness of this
pseudostrati±
ed columnar epithelium
.
Shown here are
goblet cells
and
ciliated cells
, the two most common of the approximately F ve cell types composing the respiratory
epithelium. The
goblet
cells
secrete
mucus
onto the surface of the epithelium. This mucus serves to trap airborne particles that have
not been trapped by the nasal cavities. The
ciliated
cells
convey the mucus with any captured material toward the larynx and the
pharynx.
Mucociliary escalator
is the term sometimes used to refer to this system that protects the delicate respiratory structures of
the lung from airborne microorganisms and foreign particulate matter.
Cilia
Goblet cell
Basal bodies
Ciliated columnar cell
Ciliated columnar cell
Ciliated columnar cell
Mucous
Mucous
secretory
secretory
granules
granules
Mucous
secretory
granules
Basal bodies
Basal bodies
Basal bodies
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