Which of the following causes decrease in BP: (A) Thromboxane A2, (B) Vasopressin, (C) NO, (D) PGF2
Answer is C. NOSubstances which cause vasodilatation can cause fall in BP.Substances which cause vasoconstriction can cause a rise in BP.Among the given options only NO (nitric acid) is vasodilator (causes fall in BP). Other three options cause vasoconstriction (cause rise in BP).