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': 'Calcium ions in skeletal muscles are \nSelect and explain. \nA. Transverse tubule, B. Longitudinal pa, C. Terminal cistern, D. Sarcolemma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Spread of depolarization to terminal cistern with release of Ca2+ in the myofibrils.(Ref: Textbook of physiology AK Jain 5th edition page no.166)', 'role': 'assistant'}]