This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
Nicotinic receptors are seen in all except:September 2007 
Select and explain. 
A. Neuromuscular junction, B. Autonomic ganglia of autonomic nervous system, C. Bronchial smooth muscle, D. Brain
C: Bronchial smooth muscle
Answer: C: Bronchial smooth muscle 
Explanation: Ans. C: Bronchial Smooth MuscleThe nicotinic cholinergic receptors are found in the neuromuscular junctions of somatic muscles; stimulation of these receptors causes muscular contraction. They are also found in the autonomic ganglia of autonomic nervous system andcentral nervous systemMuscarinic receptors are found in:M 1-brain M 2-heaM 3-smooth muscleM 4-smooth muscle, pancreatic acinar and islet tissue