Esophagus, Stomach, And Intestines- Lecture 10/12/21

Question 1

Mucosa

Answer 1

Made up of the epithelium, lamina propria, and muscularis mucosae

Question 2

Layers of GI wall

Answer 2

Mucosa, sbmucosa, muscularis externa, adventitia

Question 3

Esophagus epithelia

Answer 3

SSNKE

Question 4

Muscular makeup of esophagus

Answer 4

Upper 1/3= skeletal
Middle 1/3= Skeletal and smooth
Lower 1/3= Smooth muscle

Question 5

Esophageal submucosal glands

Answer 5

Often mixed serous and mucus, secretes mucus, bicarbonate, lysozyme, pepsinogen, EGF

Question 6

Gastric epithelium

Answer 6

Simple columnar

Question 7

Barrett esophagus:

Answer 7

Metaplastic to gastric or intestinal mucosa (chronic GERD)

Question 8

Gastric glands proper

Answer 8

Parietal, zymogenic, and chief cells in mucosa

Question 9

Parietal cells

Answer 9

Secrete HCl, cells with a lot of mitochondria, secrete intrinsic factor (B12 absorption)

Question 10

Intracellular canaliculus

Answer 10

Increases surface area of parietal cells, increasing HCl prduction

Question 11

Chief cells

Answer 11

Secrete pepsiogen and lipase

Question 12

Components of the small intestine

Answer 12

Duodenum, jejunum, Ileum

Question 13

Small intestine epithelium

Answer 13

Simple columnar with microvilli

Question 14

Relative distribution of goblet cells

Answer 14

More prevalent later int he tract (more goblet cells in the ileum than duodenum

Question 15

Plicae circulares

Answer 15

Submucosal core, increases surface area

Question 16

Villi

Answer 16

Lamina propria core, increases surface area

Question 17

Paneth cells

Answer 17

Secrete lysozyme, and antimicrobial proteins

Question 18

Stem cells

Answer 18

Found in crypts, generate all 4 SI cells

Question 19

Types of SI cells (4)

Answer 19

• Enterocyte
• Goblet cell
• enteroendocrine
• Paneth