lecture 22

Question 1

three regions of the small intestine?

Answer 1

duodenum
jejunum
ileum

Question 2

total length of the small intestine?

Answer 2

~6m

Question 3

longest region of the small intestine?

Answer 3

ileum

Question 4

which segment of the duodenum if retroperitoneal?

Answer 4

the initial segment

Question 5

what holds the small intestine in place?

Answer 5

mesentery

Question 6

what is contained in the small intestine mesentery?

Answer 6

arteries
veins
nerves
lymphatics

Question 7

what is the main function of small intestine?

Answer 7

absorption

Question 8

how is the small intestine modified for its function?

Answer 8

plicae circulares

Question 9

what are plicae circularis?

Answer 9

permanent large folds of the small intestine, core of submucosa

Question 10

what is found on the surface of the plicae circulares?

Answer 10

villi

Question 11

what allows villi to move back and forth?

Answer 11

muscularis mucosae

Question 12

what is the core of each villi made of?

Answer 12

FCT, lamina propria

Question 13

what is in the core of the villi?

Answer 13

lymph lacteal

capillary Network

Question 14

what enters the mesenteric veins?

Answer 14

nutrient rich, deoxygenated blood absorbed in the small intestine

Question 15

where do mesenteric veins drain?

Answer 15

hepatic portal vein

Question 16

how does the small intestine increase its surface area?

Answer 16

long 6m length
permanent folds (plicae circularis)
villi
microvilli

Question 17

What is the epithelium of the small intestine?

Answer 17

simple columnar

Question 18

where is the microvilli?

Answer 18

on the apical surface of simple columnar epithelium

Question 19

What is contact digestion?

Answer 19

involves brush border enzymes

Question 20

what diffuses through tight junctions?

Answer 20

small molecules

Question 21

what are enterocytes?

Answer 21

absorptive cells