GI Overview/Motility #2

Question 1

Gastric motility stimulation?

Answer 1

1. ⬆️Distention —> ⬆️ACh—> ⬆️Gastrin

Question 2

Gastric motility inhibition ?

Answer 2

1. ⬇️pH —> ⬇️Gastrin

2. ⬆️CCK, Secretin, GIP/GLP

Question 3

Name order of facility for the digestion of the following :

Protein
CHO
Water
Lipids

Answer 3

H2O>CHO>Proteins>Lipids

Question 4

What is the Migrating Motor Complex?

Answer 4

1. It is a peristaltic-propulsive movement initiated during fasting

Question 5

Hormone that triggers the MMC?

Answer 5

Motolin

Question 6

Where does the MMC start and end?

Answer 6

1. Start: Stomach

2. End: Ileocecal valve

Question 7

Purpose of the MMC?

Answer 7

1. Remove undigested material and bacteria: intestine —> colon
2. Prevent migration of colonic bacteria —> intestines

Question 8

When feces fill the rectum, what happens to its sphincters ?

Answer 8

1. Internal Anal Sphincter—> Relaxes

2. External Anal Sphincter—> Constricts