What unique structural features link cardiac muscle cells together, allowing electrical signals to pass rapidly?
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Intercalated discs are specialized gap junctions that physically and electrically connect individual cardiac muscle cells. This allows the heart muscle to contract in a highly synchronized, wave-like fashion, ensuring efficient pumping throughout the body. Photo: Dr. S. Girod, Anton Becker, Wikimedia Commons, CC BY 2.5.
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Source: Wikipedia (CC BY-SA)
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