Serotonin in blood

Relaxes blood vessels

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Prevents clotting of blood

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Promotes clotting of blood

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Constricts blood vessels

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Solution

The correct option is D Constricts blood vessels
Serotonin is chemically a derivative of amino acid Tryptophan: 5 Hydroxytryptamine. It is a neurotransmitter and has several other functions. Vasoconstriction is its effect on blood vessels. That is it brings about constriction of blood vessels. Hence, it is also a factor that can increase blood pressure.

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