(b) : ‘Bundle of His’ is a part of heart. A bundle of nodal fibres, atrioventricular bundle ($AV$ bundle), continues from the atrioventricular node ($AVN$) and passes through the atrioventricular septa. It emerges on the top of the interventricular septum and immediatelydivides into a right and left bundle, which give rise to minute fibres throughout the ventricular musculature of the respective sides called Purkinje fibres. These fibres along with right and left bundles are known as Bundle of His.