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19 Cards in this Set
- Front
- Back
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Gastrin
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Secreted in response to neural impulses concerning food--G cells are stimulated by enteric interneurons--
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Secretin
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Secreted by: S cells(duodenum)
Functions: Increase pancreatic secretions rich in BICARB from pancreatic duct cells, Increase BILE secretions, and increase HCO3 and water production by the liver Stimuli for Secretion: H+ or fatty acids in the duodenal lumen |
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CCK
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Secreted by: I cells(duodenum and jejunum)
Function: HOMOLOGOUS TO GASTRIN, Stimulates GALLBLADDER CONTRACTIONS and relaxation of the sphincter of Oddi to promote bile release, stimulates pancreatic enzyme secretion, INHIBITS gastric emptying Stimuli for Secretion: Fatty acids(not TG's) |
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GIP
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Secreted by: K cells in the duodenum/jejunum
Stimuli for Secretion: Glucose, AA's, FA's Function: Increases insulin secretion, decreases gastric acid production, and may inhibit gastric motility |
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Motilin
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Secreted by: M cells throughout the GI tract(NOT the same M cells that antigenic present)
Stimuli for Secretion: ? Function: Stimulates migrating myoelectric complexes |
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Ghrelin
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Hunger hormone
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What is the gastrin receptor? Why is this significant?
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CCK-B receptor. B stands for brain--similarity to CCK A
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NO
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Secreted by:
Responds to: Function: |
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Enkephalins
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Secreted by:
Responds to: Function: only one to inhibit GI secretion |
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GRP
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Secreted by:
Responds to: Function: stimulates release of gastrin from G cells |
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VIP
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Secreted by:
Responds to: Function: |
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Substance P
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Secreted by:
Responds to: Function: |
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Is saliva iso, hypo, or hypertonic to plasma?
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Hypotonic
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How is saliva essentially secreted?
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Chlorine is built up in the acinar cells and secreted in response to food or hunger and sodium follows it and water follows that
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Saliva is hypotonic, alkaline, and has a fair amount of bicarbonate.
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Saliva is hypotonic, alkaline, and has a fair amount of bicarbonate.
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How is salivary release regulated?
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EXCLUSIVELY BY NERVES--neurotransmitters are norepi and epi; ACh, NEpi, SP
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What nerve innervates the parotid gland?
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Cranial nerve 9
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What is the prime function of secretin?
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To reduce the amount of acid present in the duodenal lumen via contol of gastric secretion and buffering with bicarb--MAIN JOB IS INCREASE IN BICARB
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What are some additional effects of secretin?
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Stimulates pepsinogen release, decreases acid secretions, and is TROPHIC for the pancreas
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