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16 Cards in this Set
- Front
- Back
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Three phases of GI digestion/secretion
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Cephalic
Gastric Intestinal |
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Cells of oxyntic glands and what they secrete.
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Parietal cells: HCl, intrinsic factor
Chief cells: Pepsinogen Mucus cells: Mucus |
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Cells of pyloric glands and what they secrete.
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Mucus cells: Mucus
G cells: Gastrin |
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What is responsible for activating pepsinogen?
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pH < 5
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Three stimulants of gastric acid secretion
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Ach
Histamine Gastrin |
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Function of secretin
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Anti-acid agent
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Approximately how long after a meal does gastric secretion reach its maximum rate?
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1 hour
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2 major effects of low stomach pH after gastric emptying
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Inhibition of gastrin release
Stimulation of somatostatin release |
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Chyme in the duodenum stimulates:
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Release of secretin
Enetrogastric reflex (inhibits gastric secretion and stomach emptying) |
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Major stimulus for gastric secretion in the intestinal phase
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Circulating amino acids
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Major regulatory pathway of gastric secretions in the intestinal phase
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Gastrin
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4 primary stimuli of pepsinogen secretion
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Ach (vagal)
Acid in stomach Secretin Gastrin |
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Function of ductal cells and acinar cells of the pancreas.
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Ductal: Secretion of aqueous component (HCO3-, H20, electrolytes)
Acinar: Enzymatic component (amylase, lipase, proteases) |
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Effect of secretin on the pancreas.
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Increase HCO3 secretion.
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Effect of cholesystokinin (CCK) on the pancreas
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Increase enzyme secretion
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What stimulates gallbladder contraction?
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CCK and cholinergic vagal stimulation
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