<prompt> Atropine is useful in organophosphate poisoning because it:Reactivates acetylcholinesteraseCompetes with acetylcholine releaseBinds with both nicotinic and muscarinic acetylcholine receptorsIs a competitive antagonist of acetylcholine  <response>: Atropine acts as an antagonist at muscarinic receptors. It has no activity on nicotinic receptors and does not interfere with the release of ACh. 