Pharmacology General f12a4831 Atropine is useful in organophosphate poisoning because it: A Reactivates acetylcholinesterase B Competes with acetylcholine release C Binds with both nicotinic and muscarinic acetylcholine receptors D Is a competitive antagonist of acetylcholine High-Yield Explanation Atropine acts as an antagonist at muscarinic receptors. It has no activity on nicotinic receptors and does not interfere with the release of ACh.