GI tract 1

Question 1

Mucosa function

Answer 1

protection
absorption
secretion

Question 2

Submucosa

Answer 2

Dense irregular CT

Meissner’s plexus

Question 3

Muscularis externa

Answer 3

Auerbach’s plexus

Question 4

Serosa or adventitia

Answer 4

Serosa-when a simple squamous epithelium is present

Adventitia- when the part of digestive tract is fixed directly to abdominal or pelvic wall

Question 5

Filiform papillae of the tongue

Answer 5

LACK taste buds—only type with stratified squamous keratinized epithelium

Question 6

Fungiform papillae of the tongue

Answer 6

stratified squamous on dorsal surface of tongue

Question 7

Foliate and circumvallate papillae of the tongue

Answer 7

stratified squamous on the lateral surface of the tongue

Question 8

Esophagus mucosa

Answer 8

stratified squamous epithelium

Question 9

Esophagus muscularis externa

Answer 9

upper 1/3- skeletal muscle
middle 1/3- mixed skeletal muscle and smooth muscle
lower 1/3- smooth muscle

Question 10

Esophagus adventitia and serosa

Answer 10

Adventitia above diaphragm

serosa below

Question 11

stomach pepsin

Answer 11

initiates protein digestion

Question 12

Stomach gastric lipase

Answer 12

helps digest triglycerides

Question 13

Cardiac glands

Answer 13

short pits/short,coiled glands

Glands produce mucus

Question 14

Gastric/fundic glands

Answer 14

Medium pits/long, straight glands

mucous neck cells/Parietal cells/chief cells/enteroendocrine cells

Question 15

Pyloric glands

Answer 15

Very long pits/short slightly coiled glands

Mucous cells with few parietal and enteroendocrine cells

Question 16

Surface mucous cells

Answer 16

Form a secreting sheet on surface and in gastric pits

secretes viscous mucus high in HCO3-

Question 17

Mucous neck cells

Answer 17

Secrete mucus

Question 18

Parietal (oxyntic) cells

Answer 18

Secrete HCl and intrinsic factor

Ach/gastrin/histamine receptors–stimulate acid secretion

Question 19

Chief cells

Answer 19

serous cells

synthesize and secrete pepsinogen and lipase

Question 20

Enteroendocrine cells

Answer 20

Produce gastrin/somatostatin/ghrelin

Question 21

Stem cells

Answer 21

in isthmus and neck of mucosal glands
move upward to replace surface mucous cells
move downward to replace glandular cells