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Unformatted text preview: testines with digestive juices.
4. Chemical Digestion Carbohydrates, Fat, and Proteins are broken down by enzymes.
3 Absorption transfer of the digested portion of food into the blood from the digestive canal.
5 Defecation removal/elimination of the waste products from the body. 6. Histology of the Digestive System
Histology of the Digestive System 1.
4. All alimentary canal organs have the same 4 layers.
Mucosa (innermost layer)
Submucosa (CT containing neurovascular bundles)
Muscularis Externa (2 layers of smooth muscle)
Serosa (outermost layer, visceral peritoneum) Diagram of GI wall to
show various kinds of
glands -- some within the
wall and some without
(like the liver). These
glands have ducts that
empty into the lumen of
the gut. In all cases, the
epithelium lining the ducts
and glands is continuous
with the epithelium lining
the lumen (cavity) of the
gut. The image above shows a section of colon from a dog. Note the crypts extendingfrom the lumen, and the n...
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