<prompt> Antagonism between acetylcholine and atropineCompetitive antagonismPsychological antagonismNon-competitive antagonismNone  <response>: Ref-KDT 6e p58 Competitive antagonists bind to receptors at the same binding site active site as the endogenous ligand or agonist, but without activating the receptor. Agonists and antagonists compete for the same binding site on the receptor. Once bound, an antagonist will block agonist binding. Ex-acetycholine and atropine antagonism 