SAN - Natural pacemaker of the heart responsible for starting the cardiac cycle., AVN - Located in the lower part of the right atrium. Electically connects the atrium to the ventricle. , Bundle of His - Transmits eletrical signals from the AVN down through the heart septum towards the purkinje fibes. , Purkinje fibers - Specialised conducting fibres located in the inner ventricular walls. Create synchronised ventricular contraction. ,

Cardiac cycle definitions

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