This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
[{'content': 'Ca2+ Channel blockers would have a significant effect on muscle function in \nSelect and explain. \nA. Skeletal muscle, B. Smooth muscle, C. Both the above, D. Neither', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The calcium-channel blockers represent a group of organic chemical structures that share the ability to inhibit Ca2+ entry into excitable cells. ... Thus, calcium-channel blockers are smooth-muscle dilators and have a negative inotropic effect on the working myocardial cells of the atria and ventricles Ref guyton and hall textbook of medical physiology 12/e pg 73', 'role': 'assistant'}]