Small Intestines (5 question on final)

Question 1

Mucosa surface epithelium cells are

Answer 1

simple columnar

Question 2

Main functions of the surface absorptive cells (aka enterocytes)

of the mucosa surface epithelium

Answer 2

1. absorb water and nutrients

2. Terminal digestion in glycocalyx: cells produce the enzyme and absorb the monosaccharides and peptides created.

Question 3

How many DNES cell types in the small intestine?

We focus on what 3 types?

Answer 3

11

Type I
Type K
Type S

Question 4

regarding mucosa - surface epithelium:

what do type I DNES cells produce?

Answer 4

produce cholecytokinin (CCK), which stimulates gallbladder contraction and pancreatic secretion of enzymes from serous acini.

Question 5

regarding mucosa - surface epithelium:

what do type S DNES cells produce?

Answer 5

produce secretin, which:

1. stimulates pancreas secretion of bicarbonate from the PANCREATIC DUCTS
2. Inhibits HCL release and the movement of chyme into small intestines

Question 6

regarding mucosa - surface epithelium:

Where are paneth cells found, how long to they live, and what do they do?

Answer 6

Paneth cells are long lived (~20 days)

Location: ONLY @ bases of the crypts (intestinal glands)

Function: produce lysozyme

Question 7

In the submucosa- what do Duodenal (brunner) glands produce?

Answer 7

Primarily Alkaline mucus

Question 8

Is the small intestine lined with serosa or adventitia or both?

Answer 8

Serosa: allof jejunum and ileum; first and last 1-2cm of duodenum.

Adventitia: vertical (descending) portion of duodenum

Question 9

What kind of sphincter is the ileocecal valve?

Answer 9

A physiological and anatomical sphincter

Question 10

Where are peyer’s patches found?

Answer 10

Ileum!