<prompt> Which of the following is not true about non-depolarizing muscle relaxant?Mg2 predisposes the blockCa2 antagonizes the blockMetabolised by pseudocholinesteraseCompetitive inhibitor of acetylcholine  <response>: Among non-depolarizing blockers only mivacurium is metabolized by pseudocholinesterase. Block is potentiated by Mg2 and Ca2 increases the release of acetylcholine from nerve endings; thus paially antagonizes the block. 