Describe the conducting system of the heart.

The pacemaker cells of the sino-atrial node in the right atrium generate an impulse.This impulse travels through the atria, causing depolarisation of cardiac muscle cells and atrial contraction.The impulse wave reaches the atrio-ventricular node at the junction between the atria and the ventricles.The atrio-ventricular node slows conduction.The impulse travels down the interventricular septum via the Bundle of His.The Bundle of His then separates into 2 branches, one for each ventricle.Each ventricle depolarises and contracts as the impulse reaches them via these branches.The cardiac muscle cells repolarise and stop contracting until another impulse reaches them.

CP
Answered by Calum P. Biology tutor

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