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
Calcium ions in skeletal muscles are 
Select and explain. 
A. Transverse tubule, B. Longitudinal pa, C. Terminal cistern, D. Sarcolemma
C: Terminal cistern
Answer: C: Terminal cistern 
Explanation: Spread of depolarization to terminal cistern with release of Ca2+ in the myofibrils.(Ref: Textbook of physiology AK Jain 5th edition page no.166)