what exactly is an intercalated disc

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Something like that 😉
I think it is a "special" membrane. I didn't answer your question, but just agreeing it is a membrane. 🙂
 
An intercalated disc is an undulating double membrane separating adjacent cells in cardiac muscle fibers. Intercalated discs support synchronized contraction of cardiac tissue. They can easily be visualized by a longitudinal section of the tissue.
 
Intercalated disks are in the cardiac muscle, they help in contractions of the heart.
 
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