small intestine

Question 1

length of small intestine

Answer 1

3m long
2.5cm diameter

Question 2

3 regions of small intestine

Answer 2

duodenum
jejunum
ileum

Question 3

flow of small intestine

Answer 3

pyloric sphincter of stomach
to
duodenum
to
jejunum
to
ileum
to
illeocecal sphincter

Question 4

functions of small intestine

Answer 4

where digestion and absorption occurs

Question 5

Histology of small intestine
(4 layers)

Answer 5

Mucosa
Submucosa
Muscularis
Serosa / Visceral Peritoneum

Question 6

small intestine is suspended by the ________

Answer 6

Mesentery
(extension of peritoneum)

Question 7

3 structures that increase surface area

Answer 7

circular folds
villi
microvilli

Question 8

mechanical digestion
weak peristalsis

Answer 8

chyme remains for 3-5 hrs

Question 9

mechanical digestion
segmentation

Answer 9

local mixing of chyme with intestinal juices - sloshing back and forth

Question 10

small intestine blood supply
DUODENUM

Answer 10

Arterial supply - branches of the hepatic and superior mesenteric arteries
Venous drainage - veins from duodenum drain into portal vein

Question 11

small intestine blood supply
ILEUM and JEJUNUM

Answer 11

Arterial blood from the superior mesenteric artery
venous drainage into the superior mesenteric VEIN which drains into portal system

Question 12

Absorption defn

90% occurs in small intestine

Answer 12

is the passage of the end products of digstioninto blood or lymph and occurs by:
diffusion
facilitated diffusion
osmosis
active transport