151
CHAPTER FIVE
Tissues
FIGURE 5.10
Transitional epithelium. (
a
and
b
) When the organ wall contracts, transitional epithelium is unstretched and consists of many layers
(675×). (
c
and
d
) When the organ is distended, the tissue stretches and appears thinner (675×).
Stretched
transitional
epithelium
Basement
membrane
Underlying
connective tissue
Basement
membrane
Underlying
connective tissue
Unstretched
transitional
epithelium
(b)
(a)
(d)
(c)
Free surface
of tissue
Free surface
of tissue
Duct
Secretory portion
Tissue surface
Simple tubular
Simple branched
tubular
Simple branched
alveolar
Simple coiled
tubular
Compound tubular
Compound alveolar
FIGURE 5.11
Structural types of exocrine glands.
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