Relaxation of the internal anal sphincter is caused by
A) Nutrients in the ileum B) Stretch of the ascending colon C) Stretch of the ileum D) Stretch of the stomach E) Stretch of the sigmoid colon and rectum
Preganglionic parasympathetic nerves in the small intestine release
A) Acetylcholine onto muscle cells B) Acetylcholine onto neurons in the myenteric plexus C) Norepinephrine onto muscle cells D) Norepinephrine onto neurons in the myenteric plexus E) VIP and NO onto m uscle cells