With the help of suitable diagram, describe the conducting system of human heart.

 

Conducting system of myogenic human heart consists of sinoatrial node, atrioventricular node, bundles of His and Purkinje's fibre system.

The pacemaker of the heart is sinoatrial node because here the heartbeat originates. Pacemaker has power of generation of wave of contraction. this is modified cardiac tissue, also called a nodal  tissue.

SA node is situated in the wall of right atrium near the opening of superior vena cava. the wave of contraction generated by SA node is conducted by cardiac muscle fibres to both the atria. This results in contraction resulting into atrial systole.

The atrioventricular node ( AV node ) is located in the wall of right atrium near the opening of coronary sinus .AV node receives the wave of contraction generated by SA node through internodal pathways.

Bundle of His arises from AV node and divides into right and left bundle branches. These are located in the interventricular septum. The  bundle branches further form Purkinje fibres which penetrate into myocardium of ventricles.

The bundle of His and Purkinje fibres conduct the wave of contraction from AV node to myocardium of ventricles causing ventricular systole. 

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