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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.
1. All-or-None Law-Gap junctions allow all cardiac muscle cells to be linked electrochemically, so that activation of a small group of cells spreads like a wave throughout the entire heart. This is essential for synchronistic contraction of the heart as opposed to skeletal muscle. 2. Automicity (Autorhythmicity) - some cardiac muscle cells are self-excitable allowing for rhythmic waves of contraction to adjacent cells throughout the heart.