GI Physiology

Question 1

functions of GI tract (4)

Answer 1

ingestion
fragmentation
digestion
absorption

Question 2

layers and characteristics of GI tract

Answer 2

longitudinal, circular

lumen, epithelium, submucosa muscular externa/tunica muscularis (from innermost to outer most)

Question 3

functions of epithelium in esophagus and anus are largely

Answer 3

protective. they are non secretory and non absorptive

Question 4

functions of epithelium in stomach are largely

Answer 4

secretory

Question 5

functions of epithelium in intestines are largely

Answer 5

absorptive

Question 6

esophagus musculature

Answer 6

upper 1/3 is striated muscle

lower 2/3 smooth muscle

Question 7

anatomical parts of esophagus

Answer 7

lower esophageal sphincter, z line

Question 8

types of cells in stomach

Answer 8

surface and neck cells
partietal cells
chief cells (peptic cells)
gastric cells

Question 9

oxyntic (gastric) secretion of surface and neck cells include

Answer 9

mucous (gastric and pyloric)

Question 10

oxyntic (gastric) secretion of parietal (oxyntic) cells include

Answer 10

Hcl, intrinsic factor

Question 11

oxyntic (gastric) secretion of chief (peptic) cells

Answer 11

pepsinogen

Question 12

pyloric gland secretion of gastric cells

Answer 12

gastrin

Question 13

positive feedback for regulation of HCl (gastric) secretion includes

Answer 13

cephalic phase
gastric phase
intestine phase

(all increase production of HCl)

Question 14

negative feedback for regulation of HCl (gastric) secretions includes

Answer 14

H+ (immediate)