This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
M2 choline receptor is located at 
Select and explain. 
A. Hea, B. Lungs, C. Skeletal muscle, D. Glands
A: Hea
Answer: A: Hea 
Explanation: M2 receptors are located at Hea, Nerves, Smooth musclesM1NervesM2Hea, Nerves, Smooth musclesM3Glands, smooth muscle, endotheliumM4CNSM5CNSNMSkeletal muscle, Neuromuscular junctionNNCNS, postganglionic cell body, dendritesKatzung 13e pg:105