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 is stored in 
Select and explain. 
A. T tubule, B. Sarcoplasmic reticulum, C. Terminal cistern, D. Golgi apparatus
B: Sarcoplasmic reticulum
Answer: B: Sarcoplasmic reticulum 
Explanation: Calcium is stored in sarcoplasmic reticulum in the skeletal and cardiac muscles Calcium plays a major role in muscle contraction Ref:Guyton and Hall textbook of medical physiology 12th edition,page number: 85 ,86,87