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36 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Cells of Intestinal epithelium
6ct |
1. enterocytes or absorptive cells
2. enteroendocrine cells. 3. goblet cells 4. M (microfold) cells 5. Paneth cells 6. Stem cells |
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Intestinal epithelium is what type of epithelialum =
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a simple columnar epithelium
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what 3 celltypes are found in the crypts of Lieberkühn =
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Enteroendocrine
Paneth Stem cells |
E
D SC |
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Absorptive intestinal cells aka =
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enterocytes
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enterocytes aka =
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Absorptive intestinal cells
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enterocytes
with a prominent ____ ______ also called a ____ _____ |
brush border
striated border ending on a clear zone, called the _______ __________ |
terminal web
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brush border
contains _________ microvilli surface area 30-fold. |
3000
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brush border, contain
enzymes = 3ct |
-lactase
-maltase -sucrase reduce carbohydrates to hexoses transported by carrier proteins |
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Final breakdown of oligopeptides, initiated by the action of
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gastric pepsin
, is extended by pancreatic . 4ct |
pancreatic trypsin,
chymotrypsin elastase carboxypeptidases A and B. |
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Malabsorption syndromes
Anemia occurs when vitamin = |
B12, iron, and other cofactors cannot be absorbed.
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Malabsorption syndromes
Disturbances of the musculoskeletal system when = |
proteins
calcium vitamin D fail to be absorbed. |
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A typical clinical feature of malabsorption syndromes is
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diarrhea
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Goblet cells are columnar
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Mucus-secreting cells
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In addition to its digestive function, the gastrointestinal tract is the largest diffuse
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endocrine gland
in the body. |
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Paneth cells
have a lifetime of about |
20 days.
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The pyramid-shaped Paneth cells have a basal domain containing the
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rough endoplasmic reticulum
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three major products contained in the granules of Paneth cells are
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TNF-α
lysozyme proteins known as defensins or cryptidins |
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M (microfold) cells
overly = |
Peyer's patches
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large intestine is formed by several successive segments
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cecum
the appendix ascending transverse descending sigmoid rectum anus |
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Large Intestine
Except for the rectum, anal canal exhibits three thickened, equally spaced bands known as = |
teniae coli.
sacculations known as = |
haustra
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Plicae circulares and intestinal villi are not found beyond the =
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ileocecal valve
The mucosa has a smooth surface. |
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crypts of Lieberkühn are characteristic of the mucosa of the =
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colon
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straight tubular intestinal glands
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crypts of Lieberkuhn
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Large Intestine
The surface epithelium and the epithelium lining the glands is of |
simple columnar type
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The lamina propria is rich in
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lymphoid cells
GALT is related to the abundant bacterial population of the large intestine. |
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muscularis comprises longitudinal and circular strands. This layer differs from that of the small intestine, because fibers of the outer longitudinal layer congregate in three thick longitudinal bands called ___ ___ =
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teniae coli.
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evagination of the cecum
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APPENDIX
has abundant lymphoid follicles in its wall. has no teniae coli. |
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**Cancer of the Digestive Tract:
90–95% of malignant tumors of the digestive system are derived from = |
intestinal or gastric epithelial cells.
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Malignant tumors of the large bowel are derived almost exclusively from its glandular epithelium =
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adenocarcinomas
the second most common cause of cancer deaths in the United States. |
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rectum is the dilated portion
presence of folds called |
transverse rectal folds
mucosa is similar to that of the |
distal colon.
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The upper part of the anal canal has longitudinal folds called the
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anal columns.
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The anal canal is divide into three zones =
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1 Colorectal zone
2 Anal transitional zone 3 Squamous zone |
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The mucularis mucosae disappears at the =
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anal transitional zone ATZ.
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There is no teniae coli in
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rectum
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circular muscle layer of the muscularis externa thickens to form the
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internal anal sphincter.
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external anal sphincter is formed by
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striated muscle of the pelvic floor.
pic info + |
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