Draw a diagram of the human heart and label the $SAN$,$AVN$,$AV$ bundle,bundle of His,and Purkinje fibres.

(N/A) The human heart contains a specialized conducting system that initiates and maintains the rhythmic contraction of the heart.
$1$. $SAN$ (Sino-Atrial Node): Located in the right upper corner of the right atrium. It acts as the natural pacemaker.
$2$. $AVN$ (Atrio-Ventricular Node): Located in the lower left corner of the right atrium close to the atrio-ventricular septum.
$3$. $AV$ bundle (Atrio-Ventricular bundle): $A$ bundle of nodal fibres that continues from the $AVN$ and passes through the atrio-ventricular septa.
$4$. Bundle of His: The $AV$ bundle divides into right and left branches that run along the interventricular septum.
$5$. Purkinje fibres: These are minute fibres that arise from the bundle of His and spread throughout the ventricular musculature on their respective sides.