Transcript Document

A Few Additional Slides to Help Your
Study for BIOL 232 Lecture Exam #1
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Figure 4.5 Types of multicellular exocrine glands.
Tubular
secretory
structure
Simple duct structure
Compound duct structure
(duct does not branch)
(duct branches)
Simple tubular
Simple branched
tubular
Example
Example
Compound tubular
Intestinal glands
Stomach (gastric)
glands
Duodenal glands of small intestine
Example
Alveolar
secretory
structure
Simple
alveolar
Simple branched
alveolar
Compound alveolar
Example
Example
Example
No important
example in humans
Sebaceous (oil)
glands
Mammary glands
Surface epithelium
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Duct
Secretory epithelium
Compound
tubuloalveolar
Example
Salivary glands
Figure 4.6 Chief modes of secretion in human exocrine glands.
Secretory
cell fragments
Secretory
vesicles
(a) Merocrine glands
secrete their products
by exocytosis.
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(b) In holocrine glands, the
entire secretory cell
ruptures, releasing
secretions and dead
cell fragments.