8- Small Intestine structure and motility Flashcards

1
Q

how long is the duodenum

A

12 fingers of 25 cm

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2
Q

roel of duoduenum

A

gastic acid neutralsision, digestion, iorn absobrtion

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3
Q

jejunum length

A

2.5 m

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4
Q

jejunum role

A

nutrient absoption

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5
Q

ilium length

A

3.5 m

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6
Q

ileum role

A

nacl/h2o absorbtion

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7
Q

what are pilicae

A

fold in the intestinal track to increase surface area for absorption

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8
Q

type of eptithelium in small intestines

A

simple colunmanr epithelium

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9
Q

vili length

A

0.5 mm

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10
Q

what do re cyrps relase

A

water and cl

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11
Q

what 4 strcures inceas the absoption area in intesit

A

plicae, villi and microvillie

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12
Q

how many ties is teh area increase compared to a flat tube

A

600 times

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13
Q

what do the intresial villi absopb

A

nacl, monosaccrareis, aminoacids, peptides, fats, vitamins, minerals, water

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14
Q

how much intestinal fludi is secreted each day

A

1500ml per day

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15
Q

role of h20 in digestive process

A

maintains lumenal conttents ina liquid state
promotes mixing of nutrients with digestive system
aids nutrient presentation to absorbing surface
dilutes and washes away potentially injurious substances

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16
Q

h20 secterion comes from where

A

epithelial cells lingni crypts of lieberkuhn

17
Q

is h20 secterion active or passive

A

passive due to active section of chloride into intesal lumne

18
Q

what pumps puts cloinre into lumen

A

thorugh a clorien, naosium and potassium transporter

19
Q

how does sodium and potassium leav the intesial cells

A

potaium, diffusion
na, thorugh soidum potassium atp pump

20
Q

what is the role of the cftr

A

regulartes the role of clorien into the intela

21
Q

what prostoglydie controals cftr

A

pka

22
Q

what protiesn changes atp for camp

A

adenylate cyclase

23
Q

what is cftr

A

cystic firbosis transmembrane conductance regulator

24
Q

types of intestial mobilty

A

segmentatoin and peristalsis

25
Q

what is segmentation

A

the grinding up of food, it shifts form one part being contracted and another being relaxed and vice versa

26
Q

what is peristaltys

A

movemnet of food along git

27
Q

what cell causes sementation

A

pacemaker cell

28
Q

what cuaes regualtion oscillation in memabre poteisal in ospahgula cells

A

intestial basic electical rhymum

29
Q

what happens wiht parasymph effect and sympathic effet on segmeation

A

parasympathic increase
sympathiec decrease

30
Q

when does peristalils occur

A

when segmentaiton finnishes

31
Q

what ishte migrating motiility complex

A

pattern of peristalic activyt tranveling down small intesintes

32
Q

what cuaes the start of migraitng motiliy compex

A

one mmc ending

33
Q

what stop mmc

A

food arrival in stomac

34
Q

what is the fucntion of mmc

A

move undigested food to large intestins
limit bacterial colonistaion of small intestiens

35
Q

what is the law of the intestiens

A

if the intesties is desended the oral side of bolus contacts and the anal side of bolus relaxes moving it twoardes the colon

36
Q

whgere is the opening ileocaecal valve

A

empthy of chime into large intesites from small intesties

37
Q
A