Pharmacology The skeletal muscle relaxant, vecuronium, acts at cholinergic receptors where it exhibits: A Affinity but no efficacy B Efficacy but no affinity C Receptor upregulation D Affinity and efficacy 💡 Explanation The skeletal muscle relaxant, vecuronium, acts at cholinergic receptors where it exhibits: ✓ Correct Answer: A. Affinity but no efficacy