<prompt> All of the following are actions of muscarinic antagonists exceptDecreases gastric secretionprolongs AV conductionDecreases tracheobronchial secretionsCauses contraction of radial muscle of iris  <response>: Ref:KD Tripathi pharmacology 7th edition page.no: 114,115 Actions of Muscuranic antagonists atropine are CNS stimulation CVS: the prominent effect is tachycardia by decreasing the refractory period of the AV node and facilitate AV conduction. Gland; decrease sweat, salivary, tracheobronchial and lacrimatory secretion Smooth muscle: decrease tone and contraction Eye ; mydriasis by contraction of the radial muscle of iris Rise in body temperature 