Which among the following is a vasoconstrictor?: (A) Histamine, (B) PGI2, (C) Bradykinin, (D) TXA2
Answer is D. Ans. is 'd' i.e., TXA2 Important mediators* Vasodilatation Histamine, prostaglandins, prostacyclins, serotonin, Nitric oxide, bradykinin.* Vasoconstriction Leukotrienes (LTC4, D4, E4), Thromboxane A2.