Intestines

Question 1

what are the secretions of brunner’s glands? function?

Answer 1

1. mucus, bicarb 2. protect mucosa, neutralize acid

Question 2

what are the secretions of the crypts of lieberkuhn? function?

Answer 2

1. mucus, water, electrolytes, peptidases, sucrase, maltase, lactase, lipase, transporters 2. lubricate, absorb, digest

Question 3

what are the primary regulators of GI smooth muscle?

Answer 3

1. Ach (stimulate contraction) 2. VIP (inhibit contraction) 3. NO (inhibit contraction)

Question 4

what are the three types of intestinal motility?

Answer 4

1. MMC 2. segmental contractions 3. peristaltic contractions

Question 5

what is the main stimulus for peristaltic contractions in the small intestine?

Answer 5

distension

Question 6

in the large intestine, what stimulus is responsible for relaxation?

Answer 6

sympathetic stimulation

Question 7

what are the four key features of the defecation reflex?

Answer 7

1. intrinsic 2. parasympathetic 3. additional afferent signals 4. desired defecation

Question 8

what mediates the intrinsic reflex of defecation?

Answer 8

ENS