Term
| What type of mucosa is mainly found in the small intestines? |
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Definition
| absorptive, with villi & crypts |
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Term
| What type of mucosa is mainly found in the large intestines? |
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Definition
absorptive/protecting
-glands with lots of goblet cells |
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Term
| What type of cells produce the gastrointestinal hormones of the small intestine? |
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Definition
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Term
| How does the histology of the SI aid in digestion & absorption? |
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Definition
-glands to secrete mucous
-enzyme secretion
-delivery of products to the duodenum from pancreas & liver
-highly folded mucosa w/ microvilli to maximize absorption |
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Term
| The main folds of the small intestine are called... |
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Definition
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Term
| How does the small intestine maximize surface area? |
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Definition
Plicae circulares are the main folds which increase SA
Villi are the fingerlike projects with further increase SA
Microvilli are the brush border on the surface of enterocytes |
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Term
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Definition
| absorptive epithelial cells of she intestines |
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Term
| Why would you find smooth muscle in villi? |
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Definition
| helps move the villi to maximize absorptive efficiency |
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Term
| The lymph vessel found within intestinal villi is called a... |
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Definition
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Term
| Intestinal glands are called... |
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Definition
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Term
| What types of cells are found within intestinal crypts? |
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Definition
enterocytes
goblet cells
paneth cells
enteroendocrine cells |
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Term
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Definition
| play a bactericidal & phagocytic role |
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Term
| Why are goblet cells found more in the posterior SI & LI? |
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Definition
| facilitate movement of digesta through the tract when it is more solid |
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Term
| Where are paneth cells typically found? |
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Definition
| at the base of intestinal crypts |
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Term
| Where are goblet cells found? |
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Definition
| in the intestinal epithelium |
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Term
| The main identifying feature of the duodenum is... |
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Definition
presence of Brunner's Glands
-always found in the submucosa |
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Term
| The outermost layer of the duodenum (or other GIT component) is... |
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Definition
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Term
| The main identifying feature of the jejunum is... |
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Definition
| lack of brunner's glands or peyer's patches |
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Term
| The main identifying feature of the ileum is... |
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Definition
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Term
| What are peyer's patches? |
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Definition
| aggregated lymp nodules of the ileum |
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Term
| How does the histology of the large intestine aid in absorption/protection & concentration of waste? |
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Definition
-lacks villi (no nutrient absorption)
-lots of goblet cells
-no plicae circulares |
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Term
| Indentifying feature of LI? |
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Definition
-no plicae circularis
-no villi
-no paneth
-lots of goblet cells! |
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Term
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Definition
| brunners glands in duodenum |
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Term
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Definition
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Term
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Definition
cardiac sphincter
esophageal glands
esophagus
stomach |
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Term
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Definition
| Large intestine, goblet cells |
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Definition
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