what exactly is an intercalated disc

[IWantH2O]

is it jus the membranes between cardiac cells

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[doc3232]

Something like that
I think it is a "special" membrane. I didn't answer your question, but just agreeing it is a membrane.

 

[Albuterol]

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.

 

[utdent20]

Intercalated disks are in the cardiac muscle, they help in contractions of the heart.