GI Physio Secretions (In class)- Karius Flashcards Preview

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Flashcards in GI Physio Secretions (In class)- Karius Deck (25)
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0

what can stimulate salivation?

tastes, smells, cortical stimuli (thought), gastric/duodenal irritation

1

what are in the primary saliva secretion?

amylase, ions, mucus

2

neurotransmitter associated with salivation?

Ach

3

what are the secretions of the esophagus

mucus for lube and protection

4

gastric glands have what kind of cells?

mucus secreting cells, HCl/Intrinsic factor, enzyme precursors (pepsinogen)

5

pyloric glands have what kind of cells?

mucus secreting cells, gastrin production, pepsinogen

6

cardiac glands have?

mucus secreting cells

7

what are some of the cellular characteristics of parietal cells?

lots of mitochondria, high SA, lots of golgi

8

what stimulates pancreatic enzyme secretion?

Ach, Gastrin, CCK

9

what stimulates pancreatic bicarb secretion?

secretin

10

what occurs during the gastric phase of pancreatic secretion?

Ach and gastrin

11

what occurs during the intestinal phase of pancreatic secretion?

CCK and secretin, increase enzyme, and increase bicarb flow

12

what are the hepatic secretions?

waste products (cholesterol, bilirubin/heme), bile salts & phospholipids, water and electrolytes (duct cells and bicarb)

13

what is the purpose of adding phospholipids to secretions?

to increase the solubility of cholesterol

14

how are bile acids formed?

1. cholesterol backbone
2. primary bile acids, cholic acid, chenodeoxycholic acid
3. converted to secondary acids by bacterial action

15

how are bile salts returned to hepatocytes?

enterohepatic circulation

16

hepatic water/bicarb secretions are controlled by?

secretin and bile salts

17

what is the function of the gallbladder?

stores bile, reabsorb water/electrolytes (concentrates for room)

18

what elicits contraction of the gallbladder?

CCK, vagus (weak)

19

What cause relaxation of the sphincter of Oddi?

CCK, peristalsis (esp. duodenal)

20

what is the stimulation for intestinal secretions?

tactile stimulation of mucosa

21

what are the 3 intestinal secretions?

mucus, bicarb/water, enzymes (but aren't really secreted- bound to membrane of cells that have been sloughed off)

22

what causes mucus secretion in the colon?

tactile stim. & parasympathetic

23

bicarb secretion in colon is high due to?

need to neutralize acids from bacteria (not gastric)

24

what 2 ions are in high concentration in mouth?

bicarb and K+