lecture 22

Question 1

whats the order of the parts in the small intestine and give length

Answer 1

duodenum is 25cm, jejunum is 2.5m ileum is 3.6

Question 2

what holds the small intestine in place

Answer 2

a mysentary

Question 3

what part of the small intestine is retroperitoneal

Answer 3

the duodenum

Question 4

what does the mesentery contain

Answer 4

arteries, veins, nerves and lymphatics

Question 5

whats the path of nutrient rich, deoxygenated blood from the small intestine

Answer 5

mesenteric veins, to the hepatic portal veins

Question 6

what allows the villi on the plicae circulares to move

Answer 6

the muscularis mucosae

Question 7

what are the villi made of

Answer 7

they are foldings of the mucosa, more specifically they have a core of lamina propria, has lacteals and capillary networks inside itself

Question 8

what are absorptive cells of the small intestine called

Answer 8

these are enterocytes

Question 9

what attaches enzymes to the brush boarder and describe this thing

Answer 9

glycocalyx attaches enzymes to the brush boarder. these are glycoproteins with branched filaments

Question 10

where can we find intestinal crypts

Answer 10

between the villi of the small intestine

Question 11

what do we find in the intestinal crypt and what do these things do

Answer 11

right at bottom of crypt is the paneth cell these secrete granules and antibacterial enzymes, protecting us.
we have stem cells that divide and replace damaged cells in the intestinal crypts
we have hormone secreting endocrine cells and then the normal epithelial enterocyte