Ch17T9-11

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Author:
aphy101
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288826
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Ch17T9-11
Updated:
2015-04-05 19:46:43
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profmwinston
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Chapter 17 Topics 9-11 Digestive
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  1. ´╗┐List the 3 types of secretory cells found in gastric glands, and what they secrete.
    1) Mucous Cells (mucous) 2) Chief Cells (digestive enzymes) 3) Parietal Cells (hydrochloric acid and intrinsic factor)
  2. Secreted by mucous cells, this provides a vicious, alkaline protective layer on the stomach's inner surface.
    Mucus
  3. Secreted by chief cells, this digestive enzyme is inactive until it contacts the hydrochloric acid from parietal cells to form pepsin.
    Pepsinogen
  4. Formed from pepsinogen in the presence of hydrochloric acid, this is a protein-splitting enzyme that digests nearly all types of protein into polypeptides.
    Pepsin
  5. Secreted by parietal cells, this provides the acid environment needed for production and action of pepsin.
    Hydrochloric Acid
  6. Secreted by parietal cells, this aids in vitamin B12 absorption in the small intestine.
    Intrinsic Factor
  7. The products of the mucous cells, chief cells, and parietal cells together form what?
    Gastric Juice
  8. What are the 2 digestive reflexes.
    1) Enterogastric Reflex 2) Vomiting Reflex
  9. A digestive reflex triggered by distension of the small intestine wall and inhibits peristalsis in the stomach to slow down movement of food into the duodenum.
    Enterogastric Reflex
  10. A digestive reflex that empties the stomach in the reverse of the normal direction.
    Vomiting Reflex
  11. Following a meal, the blood concentration of bicarbonate ions increases, and the urine excretes excess bicarbonate ions.
    Alkaline Tide
  12. What are the triggers of the cephalic phase?
    Sight, smell, and thought of food
  13. A hormone produced in the stomach that functions to inhibit acid secretion.
    Somatostatin
  14. A peptide hormone that stimulates the 3 secretory cells, stimulating the digestive process.
    Gastrin
  15. In what structure are the chief cells, parietal cells, and mucous cells located?
    Gastric Pits
  16. What hormone inhibits the digestive process, and how does it inhibit it?
    Somatostatin, because it inhibits gastrin, thus, slowing down acid secretion and digestion
  17. What hormone stimulates the digestive process, and how does it stimulate it?
    Gastrin, because it stimulates the 3 secretory cells, thus, increasing acid secretion and digestion
  18. What effect does the PNS and SNS have on the production and release of somatostatin?
    PNS inhibits somatostatin, thus increasing digestion; ANS stimulates somatostatin, thus inhibiting digestion because the increased somatostatin inhibits the secretory cells
  19. List the 3 triggers of the gastric stage.
    1) Stretch of stomach lining 2) Presence of protein 3) Increased Ph
  20. In the gastric stage, what 3 chemicals are released by stomach cells in response to the triggers?
    1) Histamine 2) ATCH 3) Gastrin
  21. In the gastric stage, PNS impulses and gastrin promote the release of this hormone from gastric mucosal cells, which stimulates additional gastric secretion.
    Histamine
  22. In the gastric stage, PNS impulses cause this to be released from vagus nerve endings suppresses somatostatin and stimulates more gastric secretion.
    ATCH
  23. A peptide hormone released in the stomach by PNS impulses in the gastric stage that increases secretory activity of gastric cells.
    Gastrin
  24. What type of food moves quickest through the stomach?
    Liquids
  25. What type of food moves slowest through the stomach?
    Solids, especially fatty foods
  26. What cells are stimulated by histamine, ATCH, and gastrin?
    The parietal cells, mucous cells, and chief cells
  27. List the 3 triggers of the intestinal stage.
    1) Stretch of the duodenum 2) Lipids & Proteins 3) Acidic pH
  28. In the intestinal stage, which hormone is released due to the triggers of lipids and proteins?
    Cholecystokinin (CCK)
  29. In the intestinal stage, what is the result of the release of CCK?
    It decreases gastric motility, and intestinal somatostatin is released, which inhibits release of gastric juice
  30. In the intestinal stage, which hormone is released due to the trigger of acidic pH?
    Secretin
  31. In the intestinal stage, what is the result of the release of secretin?
    It causes the pancreas to secrete bicarbonate ions
  32. A band of smooth muscle that opens to let pancreatic juice and bicarbonate ions enter the duodenum.
    Sphincter of Oddi

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