Which of the following is involved in peristalsis by causing relaxation ?: (A) Substance P, (B) Acetylcholine, (C) VIP, (D) Norepinephrine
Answer is C. Ans. is 'c' i.e., VIP In peristlasis :- Acetylcholine & substance P - Causing smooth muscle contraction. VIP, NO & ATP - Producing relaxation ahead of stimulus.