This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: A.N.S., Subject name: Pharmacology
Vecuronium acts on : 
Select and explain. 
A. Cerebral cortex, B. Myoneural junction, C. Muscle fibres, D. Spinal cord
B: Myoneural junction
Answer: B: Myoneural junction 
Explanation: Ans. is 'b' i.e. Myoneural junction Vecuronium is a non depolarizing neuromuscular blocking agent.It acts on nicotinic receptor at neuromuscular junctions and blocks the depolarization by inhibiting Na+ channels.