This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
Cardiac msucle functions as both electrical and mechanical syncytium. The structual basis of this ability is 
Select and explain. 
A. T tubule system, B. Intercalated disks, C. Striated nature of the contractile system, D. Extensive sarcoplasmic reticulum
B: Intercalated disks
Answer: B: Intercalated disks 
Explanation: None