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Intercalated Cells. This type cell is found in the late distal tubule and is represented by the IC box. Its main function is acid-base balance. The basolateral border of this cell is freely permeable to hydrogen and potassium.
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.