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Regarding Histamine, correct statement/s
i) It is a potent vasodilator
ii) It causes for nasal congestion
iii) It stimulates the secretion of pepsin in stomach
iv) It has one primary amine group

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i only

ii, iii, iv

i, iii, iv

i, ii, iii, iv

answer is D.

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Detailed Solution

Histamine is a potent vasodilator. It has various functions.

It contracts the smooth muscles in the bronchi and gut and relaxes other muscles, such as those in the walls of fine blood vessels.

Histamine is also responsible for the nasal congestion associated with common cold and allergic response to pollen

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