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24 Cards in this Set
- Front
- Back
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What does lipase need in order to cleave fat?
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-bile
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What is an ulcer?
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-errosion of the stomach and/or pylori wall
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What are the 4 causes of ulcers?
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-lack of mucus
-excess HCL -too much protiases -Helicobactor Pylori (breaks down mucus) |
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What happens when ulcers are not treated?
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-acid can eat through organs
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Why do you need mucus in the stomach?
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-to protect from abrasion
-protect stomach wall from acid |
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What happens when you don't have enough mucus?
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-ulcers form
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What do villi of the small intestines do?
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-collect nutrients and trasports them to capillaries
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What can't capillaries of the small intestines absorb?
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-fats
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Where do fats get absorbed?
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-at lactile (lymphatic vessel)
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Why can't fats get absorbed in capillaries?
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-too bulky to go through walls of tiny vessels
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Where do fats get transported to? What transports them there?
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-goes straight to liver for refining by thoracic duct
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Where do fats go after passign through the liver?
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-get dumpped into subclavian vein and gets spread to entire body
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Where does fat get broken down?
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-at celiac trunk
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Why do fats get spread aroudn the body?
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-can't break up fat all at once
-gets diluted |
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Why do chief cells produce pesinogen?
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-if there is too many active forms of pepsin, you'd digest yourself
-cleaves proteins -proteisn are main molecules of cells |
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What is one type of molecule that the stomach absorbs into its walls?
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-alcohol
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What are gastric pits?
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-place where enzymees are secreted by specific cells
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What are the cells within in the gastric pits and their order from superficial to deep?
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1.simple columnar cells/surface mucus cells
2. neck cells 3. parietal cells 4. chief cells 5. enteroendocrine cells 6. stem cells |
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When do gastric pit cells get replaced?
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-every 6-8 days
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What is vitamin B12 and how does it get abosrbed in the body?
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-helps make stronger erythrocytes to carry more oxygen
-can't be absorbed in intestines -intrinsic factor transports across intestinal wall |
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What is the duodenum?
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-connects directly to stomach
-10 inches long -1 inch in diameter -mixes stoamch fluids, bile, and enzymes from pancreas and inself |
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What is the jejunum?
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-3.5 inches long
-place where most absorption occurs -uses peristalsis and segmentation the most |
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What is the ileum?
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-6.5 inches long
-remainder of absorption occurs -"clean up" area for excretion |
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What does the large intestines absorb?
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-electrolytes
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