<prompt> Mechanism of action of d-tubocurarine isCompetitive, nondepolarizing block at the Nm cholinergic receptorNon - competitive, nondepolarizing block at the Nm cholinergic receptorCompetitive, depolarizing block at the Nm cholinergic receptorNoncompetitive, depolarizing block at the Nm cholinergic receptor  <response>: Depolarizing MR - Succinylcholine - Shoest acting MR - CI in nerve and muscle injury because it can cause K - Hypehermia can occur. - It causes fasciculations responsible for post-operative muscle pain. Non - Depolarizing or competitive MR d- Tubocurarine - It releases lot of histamine that leads to vasodilation and bronchoconstriction. It competitively inhibit the Nm receptor. 