By blocking the effect of acetylcholine at muscarinic but not nicotinic receptors, atropine is able to block parasympathetic effects while not influencing sympathetic activity at all.

Question

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Atropine specifically targets the muscarinic receptors that are activated by acetylcholine in the parasympathetic nervous system, while not affecting the nicotinic receptors that are involved in sympathetic activity. This selective action allows atropine to block only parasympathetic effects, leaving sympathetic activity intact.

By Blocking the Effect of Acetylcholine at Muscarinic but Not