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
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