This structure is unique to cardiac muscle cells, and allows individual cells to be firmly attached to each other (to provide mechanical strength during contraction), and also allow the action potential to spread rapidly through the cardiac muscle tissue, so that contractions are smooth and coordinated:

Intercalated Discs

Explanation:

Intercalated discs are known to be or considered as the unique structural arrangement which is mostly found in between myocardial cells of blood-pumping organs in the human being. They tend to play a vital roles in the fastening heart muscle cells in together and thus transmitting the signals in between the cells.

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