<prompt> Which muscarinic receptor causes dilatation of vessels?M1M2M3M4  <response>: Ans. is c i.e., M3Ref: Rapid Review of Physiology p.j32M3 receptors are found in vessels endothelium.Activation of these receptors causes vasodilation by release of EDRFNO.Unique muscarinic receptors in that their activation does not cause release of acetylcholine, rather causes release of EDRFNO. 