Physiology Cardiovascular system 34b2a5a9 All are true about nitric oxide except A Acts through cAMP B Helps to regulate vascular tone C Impoant role in penile erection D Present in low concentration in cigarette smokers High-Yield Explanation NO acts through guanylyl cyclase.Ref: Ganong&;sReview of medical physiology, 24th edition.Pg no. 151