What class of receptors do anticholinergic agents primarily target?

Anticholinergic agents primarily target muscarinic receptors, which are a subtype of acetylcholine receptors found in various tissues in the body, including the heart, smooth muscle, and glands. By blocking these receptors, anticholinergic drugs inhibit the actions of acetylcholine, a neurotransmitter that promotes parasympathetic nervous system responses such as salivation, lacrimation, urination, digestion, and defecation. This blockade results in effects such as reduced secretions, decreased gastrointestinal motility, and increased heart rate.

Muscarinic receptors are distinct from nicotinic receptors, which are another class of acetylcholine receptors but are mainly found at the neuromuscular junction and within the autonomic ganglia. The other receptor classes mentioned, such as beta receptors and dopamine receptors, are not directly influenced by anticholinergic agents, as they are associated with different signaling pathways and physiological responses. Thus, the primary action of anticholinergic agents is indeed on muscarinic receptors, making this the correct choice.