<prompt> Rate limiting step in cholinergic transmission ?Synthesis of acetylcholine from cholineActive uptake of choline in axonsActive uptake of acetylcholine by synaptic vesicleRelease of acetylcholine from synaptic vesicle  <response>: Ans. isbi.e., Active uptake of choline in axonsAcetylcholine synthesis and releaseCholine is actively taken up by the axonal membrane by Na; choline cotranspoer. Rate limiting step. This step is blocked by Hemicholinium. 