Adjacent cardiac muscle cells are joined together end-to-end in the ventricles by

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Adjacent cardiac muscle cells are joined together end-to-end in the ventricles by intercalated discs, which contain gap junctions that allow for coordinated contraction of the heart muscle. Sarcomeres are the functional units of muscle contraction, Purkinje fibers are specialized conducting cells found in the heart's conduction system, and the sinoatrial and atrioventricular nodes are located in the heart's electrical system and are involved in regulating heart rate and rhythm.

Adjacent Cardiac Muscle Cells Are Joined Together End-To-End in the Ventricles