<prompt> Muscarinic receptors on blood vessel endothelium causeVasodilatation through acetylcholineVasodilatation through NOVasoconstriction through acetylcholineVasoconstriction through endotheline  <response>: Ans. isb i.e., Vasodilatation through NONo direct cholinergic supply is present in blood vessels.But cholinergic receptor M, types are present on blood vessels endothelium.Stimulation of these receptors causes release of EDRF NO from endothelium resulting in vasodilatation. 