GI 2 Flashcards

1
Q

these are specialized folds in the small intestine that contain blood vessels and lacteals

A

villi

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2
Q

these increase surface area even more by forming the brush border

A

microvilli

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3
Q

this is the microenvironment for enzyme release and digestion/ absorption

A

brush border

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4
Q

what is one major function of the liver?

A

bile production

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5
Q

function of bile

A

makes fats soluble

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6
Q

the liver produces _______ from heme breakdown

A

bilirubin

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7
Q

what structure stores and concentrates bile?

A

gallbladder

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8
Q

what stimulates bile release from the gallbladder?

A

CCK and vagus nerve

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9
Q

what stimulates the release of CCK?

A

lipids in the duodenum

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10
Q

what are the main components of bile?

A

bile salts
phospholipids
cholesterol
bile pigments

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11
Q

this component of bile emulsifies fats

A

bile salts

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12
Q

insoluble bilirubin is bound to _______ in the blood

A

albumin

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13
Q

bilirubin is conjugated to what in the liver?

A

glucoronic acid

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14
Q

conjugated bilirubin is broken down into what 2 things in the small intestine?

A

urobilin- urine
stercobilin- stool

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15
Q

this results from abnormally high accumulation of bilirubin the blood

A

jaundice

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16
Q

indirect bilirubin is ___________

A

unconjugated

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17
Q

direct bilirubin is ____________

A

conjugated

18
Q

bile acids are made from ______

A

cholesterol

19
Q

bile acids are conjugated with what to their final bile salt structure?

A

glycine
taurine
(amino acids)

20
Q

bile salts are _________, which allows them to act as emulsifiers

A

amphiphathic

21
Q

what transports bile back into the portal system?

A

Na+/ bile cotransporter

22
Q

where is bile reabsorbed?

A

ileum

23
Q

after fat is emulsified, what breaks it down into micelles?

A

pancreatic lipase and colipase

24
Q

after absorption, lipids are ________

A

reassembled

25
Q

lipids enter the lacteals as a _______

A

chylomicron

26
Q

triglyceride digestion results in…..

A

monoglycerides and free fatty acids

27
Q

cholesterol digestion results in…..

A

ester digestion to cholesterol and fatty acid

28
Q

phospholipid digestion results in…

A

lysolecithin and fatty acid

29
Q

these have low cholesterol levels and carry cholesterol and triglycerides to adipose tissue

A

VLDLs

30
Q

these are the main carrier of cholesterol and drop it off to “needy” cells

A

LDLs

31
Q

these remove excess cholesterol from cells and vascular membranes

A

HDLs

32
Q

what organs does the liver receive blood from?

A

spleen
stomach
pancreas
small intestine
colon

33
Q

where do blood from the hepatic artery and portal vein mix?

A

sinusoids

34
Q

bile in the liver is released into bile ________

A

canaliculi

35
Q

phase 1 drug metabolism in the liver includes….

A

CYP450 enzyme breakdown

36
Q

phase 2 drug metabolism in the liver includes…

A

making the substance more water soluble

37
Q

sugars must be absorbed as _______

A

monosaccharides

38
Q

how are fat soluble vitamins (A, D, E, K) absorbed?

A

just like dietary lipids

39
Q

cecal distention causes the ileocecal valve to __________

A

constrict

40
Q

are enzymes secreted in the large intestine?

A

no

41
Q

what does the large intestine secrete?

A

mucus