SAN sends out regular waves of electrical activity- causing both atria to contract simultanesoulsy
Band of non-conducting collagen tissue prevents the waves of electrical activity being passed directly from atrai to ventricles....allows slight time delay (allows for drainage of atria)
Electrical impulse sent from SAN to (AVN)
From AVN then transferred to Bundle of His... to Purkyne fibres
Purkyne fibres carries waves of electrical activity into muscular walls of ventricles- causing them to contact simultaneouly from botton (apex) upwards
