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10 Cards in this Set
- Front
- Back
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Mixing/propulsion in:
mouth esophagus stomach SI colon |
mouth: chewing, swallowing
esophagus: none, swallowing stomach: retropulsion, peristalsis SI: segmentation, peristalsis colon: haustrations, mass movements |
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SNS __________ secretion.
PNS __________ secretion. Saliva is a _______ type of secretion, with what components? Secreted saliva is ____tonic, with _____ Na+/Cl- and ______ K+/HCO3-. |
SNS - decreases GI blood flow --> decreases secretions
PNS - increases secretions watery - amylase, K+, HCO3 hypotonic, lowered Na/Cl, raised K/HCO3 |
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Chief cells release:
Parietal cells release: What activates pepsinogen? What pumps H+ into the stomach? What else gets secreted? In exchange for? |
chief cells - pepsinogen
parietal cells - H+ H+ activates H+/K+ pump (HCl) HCO3- exchanged for Cl- |
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Where does the HCO3 come from in the cell?
What stimulates pepsinogen release? (3) What stimulates mucus secretion? |
Carbonic anhydrase rxn (CO2 + H2O --> H+ + HCO3-)
secretin, Ach, H+ PGE2 |
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Ach binds to ___ receptor on parietal cell --> more H+
______ binds to the CCKb receptor --> more H+ What cells release histamine? Histamine - what receptor? Mechanism for H+ release? |
M,M3
Gastrin entero-chromaffin-like --> H2 receptor --> increased cAMP, activates H+/K+ pump |
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What inhibits the entero-chromaffin-like cells from releasing histamine?
Released from? What inhibits the parietal cells? |
somatostatin from D cells
H+, PGE2 |
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What blocks the histamine pathway in the parietal cell?
What drug blocks PGE2? What activates trypsin? From where? Centroacinar cells in the pancreas release: |
PGE2
ASA enterokinase from intestines HCO3- |
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What stimulates release of enzymes from the pancreas?
What stimulates release of HCO3- from the pancreas? Why does returning bile salts to the liver cause release of more bile salts? |
Ach, gastrin, *CCK-PZ*
secretin stimulates HCO3- tells liver to prepare for the NEXT MEAL. |
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What elicits contraction of the GB? What nerve also has a weak effect?
What relaxes the sphincter of Oddi? |
CCK-PZ, vagus nerve
CCK-PZ, duodenal peristalsis |
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What do the intestines secrete?
Stimulus? Colon secretions? function? |
intestine:
HCO3/H2O, neutralize acids- mucus, enzymes - tactile stimulation Colon: mucus: hold feces together, protection from bacteria- HCO3-: acid neutralization -tactile stimulation |
