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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.
While each cell is not very strong by itself, millions of cardiac muscle cells working together are easily able to pump all of the blood in the body through the heart in less than a minute. Cardiac muscle cells have a branched shape so that each cell is in contact with three of four other cardiac muscle cells. Together all of the cardiac muscle cells in the heart form a giant network connected end to end. At the ends of each cell is a region of overlapping, finger-like extensions of the cell membrane known as intercalated disks.