Purkinje fibers in the heart are the modified muscle fibers that

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Purkinje fibers are specialized muscle fibers in the heart's conduction system that are capable of generating spontaneous depolarizations, which helps in the propagation of electrical signals for the coordinated contraction of the heart muscles. They do not form a high resistance path, are not the primary pacemaker (that's the role of the sinoatrial node), and do not have an unusually large number of contractile filaments compared to other cardiac muscle cells.

Purkinje Fibers in the Heart Are the Modified Muscle Fibers