Atropine is useful in organophosphate poisoning because it
Atropine acts as an antagonist at muscarinic receptors. It has no activity on nicotinic receptor and do not interfere with the release of ACh Ref-KDT 6/e p106
Reactivates Acetylcholineesterase
Competes with acetyl chloline release
Binds with both nicotinic and muscarinic acetylcholine receptors
Is a competitive antagonist of acetylcholine
Autonomic nervous system