The purpose of the AV node is to __ and the purpose of the Purkinje fibres is to__.

• 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 localized groups of ventricular fibres.