8- Small Intestine structure and motility Flashcards
how long is the duodenum
12 fingers of 25 cm
roel of duoduenum
gastic acid neutralsision, digestion, iorn absobrtion
jejunum length
2.5 m
jejunum role
nutrient absoption
ilium length
3.5 m
ileum role
nacl/h2o absorbtion
what are pilicae
fold in the intestinal track to increase surface area for absorption
type of eptithelium in small intestines
simple colunmanr epithelium
vili length
0.5 mm
what do re cyrps relase
water and cl
what 4 strcures inceas the absoption area in intesit
plicae, villi and microvillie
how many ties is teh area increase compared to a flat tube
600 times
what do the intresial villi absopb
nacl, monosaccrareis, aminoacids, peptides, fats, vitamins, minerals, water
how much intestinal fludi is secreted each day
1500ml per day
role of h20 in digestive process
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
h20 secterion comes from where
epithelial cells lingni crypts of lieberkuhn
is h20 secterion active or passive
passive due to active section of chloride into intesal lumne
what pumps puts cloinre into lumen
thorugh a clorien, naosium and potassium transporter
how does sodium and potassium leav the intesial cells
potaium, diffusion
na, thorugh soidum potassium atp pump
what is the role of the cftr
regulartes the role of clorien into the intela
what prostoglydie controals cftr
pka
what protiesn changes atp for camp
adenylate cyclase
what is cftr
cystic firbosis transmembrane conductance regulator
types of intestial mobilty
segmentatoin and peristalsis
what is segmentation
the grinding up of food, it shifts form one part being contracted and another being relaxed and vice versa
what is peristaltys
movemnet of food along git
what cell causes sementation
pacemaker cell
what cuaes regualtion oscillation in memabre poteisal in ospahgula cells
intestial basic electical rhymum
what happens wiht parasymph effect and sympathic effet on segmeation
parasympathic increase
sympathiec decrease
when does peristalils occur
when segmentaiton finnishes
what ishte migrating motiility complex
pattern of peristalic activyt tranveling down small intesintes
what cuaes the start of migraitng motiliy compex
one mmc ending
what stop mmc
food arrival in stomac
what is the fucntion of mmc
move undigested food to large intestins
limit bacterial colonistaion of small intestiens
what is the law of the intestiens
if the intesties is desended the oral side of bolus contacts and the anal side of bolus relaxes moving it twoardes the colon
whgere is the opening ileocaecal valve
empthy of chime into large intesites from small intesties
