The blockade of what receptors causes dry mouth, blurred vision, urinary retention, and constipation?

A. Alpha 1 receptor: Alpha-1 receptor blockade primarily causes vasodilation, leading to orthostatic hypotension and dizziness. It does not directly produce anticholinergic effects such as dry mouth, blurred vision, urinary retention, or constipation. B. Ligand receptor: “Ligand receptor” is a general term describing any receptor activated by a ligand and is not specific to cholinergic-mediated side effects. It does not explain the constellation of anticholinergic symptoms listed. C. Corpus lysergic receptor: There is no receptor specifically called a corpus lysergic receptor. This term is not associated with antipsychotic pharmacology or the mechanisms causing dry mouth, constipation, or urinary retention. D. Muscarinic cholinergic receptors: Blockade of muscarinic acetylcholine receptors interferes with parasympathetic nervous system functions, leading to classic anticholinergic side effects including dry mouth, blurred vision, urinary retention, and constipation.