There are two syncytia of the heart: the ventricular syncytium and the atrial syncytium separated by fibrous tissue.
The syncytia allows rapid propagation of action potentials throughout the network of interconnected fibers that when one muscle cell contracts they all eventually contract.
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As cardiac nerve transmission flows through the pathway of SA Node, atrial syncytium, junctional fibers, AV Node, Bundle of His, Purkinje fibers, and finally, ventricular ...
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