<prompt> Vasoconstrictor anong these -NOPGI2Angiotensin-IIANP  <response>: Ans. is c i.e., Angiotensin-IIo Important chemical regulator of CVS are :Vasoconstrictors : Noradrenaline, Adrenaline, ADH vasopressin, angiotension II, Endothelins, PGF2, thromboxane A2.Vasodilators: Kinins Bradykinin, lysyl-bradykinin, PGE2 PGI2 prostacyclin. VIP, ANP, Nitric oxide NO. 