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The purpose of the AV node is to and the purpose of the Purkinje fibres is to
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(a) create simultaneous atrial and ventricular depolarisation; speed up transmission of the cardiac impulse into the ventricle.
(b) delay ventricular depolarisation relative to atrial depolarisation; insulate the cardiac impulse from the general ventricular fibres.
(c) delay ventricular depolarisation relative to atrial depolarisation; transmit the cardiac impulse to very small localised groups of ventricular fibres.
(d) delay atrial depolarisation relative to ventricular depolarisation; transmit the cardiac impulse to very small localised groups of ventricular fibres.
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