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GI > PHYS > Flashcards

PHYS Flashcards

1
Q

cephalic phase of secretion always work via the ___________________

A

vagus nerve

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2
Q

what are the fat soluble vitamins?

A

A
D
E
K

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3
Q

which cells secrete gastrin?

A

G cells of stomach

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4
Q

what is the stimulus for gastrin secretion?

A

small peptides & aa
distention of stomach
Vagus (via GRP)

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5
Q

what inhibits gastrin secretion?

A

inhibited by too much H+ in stomach

inhibited by somatostatin

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6
Q

what are the actions of gastrin?

A

increase gastric acid secretion

stimulates growth of the gastric mucosa

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7
Q

which cells secrete CCK?

A

I cells of duodenum & jejunum

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8
Q

what stimulates CCK secretions?

A

small peptides and amino acids

fatty acids

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9
Q

what are the actions of CCK?

A

stimulates contraction of gallbladder & relaxes sphincter of Oddi

  • increase pancreatic enzyme & bicarb secretion
  • increase growth of exocrine pancreas/gallbladder
  • inhibits gastric emptying
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10
Q

which cells release secretin?

A

S cells of the duodenum

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11
Q

what stimulates the release of secretin by s cells?

A

H+ in duodenum

fatty acids in the duodenum

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12
Q

what are the actions of secretin?

A

increases pancreatic bicarb secretion
increases biliary bicarb secretion
decreases gastric acid secretion

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13
Q

what is the site of secretion for GIP?

A

duodenum & jejunum

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14
Q

what stimulates GIP secretion?

A

fatty acids, amino acids, and glucose

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15
Q

what are the actions of GIP ?

A

increases insulin secretion

decreases gastric acid secretion

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16
Q

the ductal cells in salivary glands reabsorb what 2 main ions?

A

sodium & chloride

17
Q

the ductal cells in salivary glands secrete what 2 main ions?

A

K+ & bicarb

18
Q

at low flow rates the pancreas secretes an isotonic fluid that is composed mainly of what two ions?

A

Na+ & Cl-

19
Q

at high flow rates the pancreas secretes an isotonic fluid that is composed mainly of what two ions?

A

Na+ & bicarb

20
Q

at low flow rates saliva is least like the initial secretion from the acinus it has the lowest concentration of what 2 ions and a high concentration of what other ion?

A

low concentration of Na+ & Cl- (which is reabsorbed)

high concentration of K+ (which is secreted)

21
Q

at high flow rates saliva is most like the initial secretion from the acinus and has the highest concentration of what 2 ions and the lower concentration of what other ions?

A

higher concentrations of Na+ & Cl- (which is reabsorbed)

lower concentrations of K+ (which is secreted)

22
Q

somatostatin is inhibited by stimulation of what nerve?

A

vagus

GI (12 decks)

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