abdominal viscera lab Flashcards
what supplies the stomach
coeliac trunk
exocrine means
secretes enzymes into the gut
endocrine means
secretes hormones into the blood
the function of bile
emulsify fats to prep them for uptake into lymph nosed
place circulars
increase surface area of smalll intestine and increase contact tie with contents to facilitate absorption of nutrients
differences in vascular patterns in the small intestine
longer vasa recta and more place in jejunum, more arterial arcades in ileum
advantage of the small intestine being so long
ti maximise the amount of time that food is in contact with the wall, so the intestine can absorb as much nutrition as possible
why is the mucosa of the large intestine different to the rest of the digestive tract
no villi or place (smooth mucosa to prevent damage from solid faeces)
what is the function of the large intestine in humans
primarily reabsorption of water from digested food contents - creation of faeces
what is the purpose of the marginal artery
it acts as larger anastomoses, so that if any one artery is compressed by gut contents or body position the gut maintains a stead blood supply, to ensure it doesn’t become ischaemic
blood returning from digestive organs
is collected by the portal vein and drained to the liver
if the portal vein issue blocked or contracted
blood in the veins draining the GIT can return to the vena cava and system circulation via portocaval anastomoses
where is the major portocaval anastomoses
lower oesophagus
why is shelving dangerous
portocaval anastomoses into the middle/inferior rectal veins, bypass the liver,
high drug concentration that hasn’t been filtered through the liver
increased OD risk
jejunum and ileum mesentary
the mesentery proper
