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Best Answer: Intercalated discs are areas where cardiac muscle cells (among a few other cell types) are joined together. These discs contain gap junctions, which are small pores that connect the cytoplasm of one cell to the next.
A Closer Look: Cardiac Muscle Cells. Cardiac muscle cells are rectangular shaped cells connected by regions called intercalated discs. Intercalated discs contain gap junctions and desmosomes. The gap junctions, which are protein-lined tunnels, allow direct transmission of the depolarizing current from cell to cell, across the chambers of the heart, so that the cells contract in unison. Because of the way these gap junctions function, the cardiac muscle cells are said to be electrically coupled. The desmosomes hold the cardiac muscle cells together during contraction, induced by the sliding of the cardiac myofibrils.