<prompt> Shortest acting muscle relaxant isSuccinylcholineVecuroniumPancuroniumAtracurium  <response>: Ans aSuccinylcholine is the only available depolarizing neuromuscular blocker. It is characterized by rapid onset of effect and ultrashort duration of ac-tion because of its rapid hydrolysis by butyryl cholinesterase.Classification of nondepolarizing neuromuscular blockers according to duration of action time to T1 25 of control after twice the ED95Class of BlockerLong-Acting 50 minIntermediate- Acting 20-50 minShort-Acting 15-12 minUltrashort- acting 10-12minSteroidal compoundPancuronium pipecuroniumVecuronium Rocuronium Benzylisoquinolinium compoundsd-Tubocurarine Metocurine DoxacuriumAtracurium CisatrucuriumMivacurium Others Asymmetrical mixed-onium chlorofumarates GantacuriumPhenolic etherGallamine Diallyl derivative of toxiferineAlcuromum 