Serotonin (5-HT) is one of several mediators of the signs and symptoms of carcinoid tumor. When released from this neoplasm, most of the manifestations of 5-HT are the result of activation of the 5-HT2 receptor. These manifestations are therefore likely to include which of the following effects?

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Vikas Bhardwaj
Medical Technologist, AIIMS New Delhi
Updated: Apr 17, 2026