Antegrade peristalsis due to?
a) Ach
b) Serotonin
c) Substance P
d) VIP
Correct Answer - D
Ans: D. VIP
Defined as a motor pattern of the gut organ musculature that can
propel content into the anal (antegrade peristalsis) or oral
(retrograde peristalsis) direction.
Impulses traveling orad activate ascending contraction:
Neurotransmitters here are acetylcholine, substance P, and
neurokinin A.
Impulses traveling caudad activate descending relaxation:
Neurotransmitters here are VIP, NO, and PACAP (pituitary adenylyl
cyclase activating polypeptide).