The structures of the heart cells called the intercalated disks make the conduction of impulses through the heart much more efficient.

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Intercalated disks are specialized cell-to-cell junctions that connect cardiac muscle fibers to one another. They contain gap junctions which allow for small molecules and ions to pass easily between cells, facilitating rapid conduction of electrical impulses through the heart. This makes the conduction of impulses through the heart much more efficient.

The Structures of the Heart Cells Called the Intercalated Disks