_________ is a potent vasodilator.

Histamine

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Serotonin

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Codeine

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Cimetidine

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Solution

The correct option is A Histamine
$H i s t a m i n e$ is a potent vasodilator. It contracts smooth muscles and relaxes other muscles of blood vessels of stomach walls. In stomach, histamine stimulates the secretion of hydrochloric acid and pepsin.

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How histamine acts as potent vasodilator?

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