Histamine,a Vasodilator,is Responsible for a Wide Variety of Physiological Effects

question 35

Multiple Choice

Histamine,a vasodilator,is responsible for a wide variety of physiological effects.Rank the three nitrogen atoms in histamine in increasing order of basicity,putting least basic nitrogen atom first.

• A)N2 < N1 < N3
• B)N1 < N2 < N3
• C)N3 < N1 < N2
• D)N3 < N2 < N1

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