All of the following are actions of muscarinic antagonists except: (A) Decreases gastric secretion, (B) prolongs AV conduction, (C) Decreases tracheobronchial secretions, (D) Causes contraction of radial muscle of iris
Answer is B. 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