Carcinoid syndrome is due to: March 2013: (A) Adrenaline, (B) Noradrenaline, (C) Serotonin, (D) Dopamine
Answer is C. Ans. C i.e. Serotonin Carcinoid syndrome It refers to the array of symptoms that occur secondary to carcinoid tumors. The syndrome includes flushing and diarrhea, and, less frequently,hea failure and bronchoconstriction. It is caused by endogenous secretion of mainly serotonin and kallikrein.