InSight
E p ith e lia l t is s u e
Figure 3.22
Peritoneum
Epithelium is classified according to the shapes and layering of epithelial cells. The various
types of epithelium line parts of various organs and perform various functions (see below),
including diffusion, osmosis, absorption, secretion,
filtration, mucus movement, and protection.
Surface view of simple squamous epithelium
of mesothelial lining of peritoneum
Plasma membrane
Nucleus of simple squamous cell
Cytoplasm
450x
Simple squamous epithelium
Simple
squamous cell
Basement
membrane
Connective
tissue
Blood capillary
Kidney
Connective
tissue
( 23
100x
Lumen
of tubule
Connective
tissue
Nucleus of simple
cuboidal cell
® ©
©
Simple cuboidal cell
tissue
Sectional view of simple cuboidal
Simple cuboidal epithelium
epithelium of urinary tubules
Mucus
goblet i
Lumen of jejunum
Nucleus of
absorptive
cell
Nucleus of
goblet cell
Basement
membrane
Small
intestine
Simple •'''
columnar
Connective
Microvilli
Mucus in
goblet cell
Absorptive
cell
Basement
membrane
Connective
tissue
Sectional view of noncililated simple columnar
Nonciliated simple columnar epithelium
epithelium of lining of jejunum of small intestine
Classifying epithelium:
Cell shape
Q
, / g f iffy
Basement
-
J
j
4
j
/
j i^m e^brane
Squamous
Cuboidal
Columnar
74 CHAPTER 3
Cells and Tissues
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