The action of histamine that is not mediated through
H1 receptors is:
A. Release of EDRF from vascular endothelium
resulting in vasodilatation
B. Direct action on vascular smooth muscle
causing vasodilatation
C. Bronchoconstriction
D. Release of catecholamines from adrenal
medulla

1 Answer

Answer :

B. Direct action on vascular smooth muscle
causing vasodilatation

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