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35 terms

Physio Exam 3- DIGESTIVE

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The 3 agonists of the parietal cell?
Acetylcholine, gastrin, and histamine
Secretin stimulates the secretion of?
pancreatic juice and bile
Secretin inhibits what?
the action of gastrin on parietal cells
What action does CCK have on the pancreas?
secretion of enzymes
What action does CCK have on the gall bladder?
release of bile
What action does CCK have on the stomach?
gastric emptying
Which of the hormones of the GI tract stimulate the secretion of insulin?
GIP
Which paracrine agent has an inhibitory effect throughout the GI tract?
Somatostatin
Pacemaker cells for GI smooth muscle are called?
cells of Cajal
3 ways to trigger secretion of gastrin?
food in the stomach, peptides, and vagal stimulation
When present, gastrin causes the release of what?
HCl
The contraction during peristalsis is caused by the activation of neurons by the local plexus that release what?
Substance P and ACh
The relaxation during peristalsis is caused by the activation of neurons that release what?
NO, VIP, and ATP
Bile contains what?
bile salts, bile pigments, and bile acids
Starch digestion begins in the mouth when the salivary glands release what?
salivary amylase
Protein foods are largely acted on in the stomach by what?
pepsin
For the stomach protein-digesting enzyme to become active, what is needed?
HCl
The small intestine is protected by the action of hydrochloric acid in chyme by ______ which is ducted in by the pancreas.
bicarbonate rich fluid
This hormone stimulates the pancreas to release bicarbonate-rich juice.
Secretin
This hormone stimulates the pancreas to release enzyme-rich juice.
CCK
This hormone stimulates increased production of gastric juice.
Gastrin
This hormone causes the gallbladder to release stored bile.
CCK
This hormone causes the liver to increase its output of bile.
CCK and Secretin
Which type of cells secrete histamine?
ECL cells
Which type of cells secrete pepsinogen?
Chief cells
Which type of cells secrete mucous?
Goblet cells
Which type of cells secrete intrinsic factor for vitamin B12 absorption?
Parietal cells
Which type of cells secrete HCl?
Parietal cells
Which type of cells secrete the hormone gastrin?
G cells
It is stimulated by the presence of acid in the small intestine and stimulates bicarbonate release from the pancreas and bile ducts.
Secretin
It is stimulated by glucose and fat in the small intestine and increases insulin and amplifies the insulin responses to glucose.
GIP
It is inhibited by acid in the stomach and stimulates acid secretion from the stomach.
Gastrin
It is stimulated by amino acids and fatty acids in the small intestine and stimulates pancreatic enzyme secretion.
CCK
What does omeprazole do?
inhibits H+ K+ ATPase
Secretory fluxes of fluid are largely driven by the active transport of _______ ions into the lumen.
Chloride