what is the function of the pukrinje fibres in the heart?

SAN node conducts wave of excitations over the walls of the atria, but since there is a slightly delay when it passes over the walls of the atria, this gives time for the atria to finishing contracting. But, the ventricle would need to contract now but since there isn’t a direct pathway, the wave of excitations travels through purkyne fibres through atrioventricular node to base of the ventricle, this will allow the heart to contract from the apex


So in short, it’s involved in the frequency of contraction for a wide range of functionalities.

thank you so much! and this is all within the ventricular myocardium

SAN node conducts wave of excitations over the walls of the atria, but since there is a slightly delay when it passes over the walls of the atria, this gives time for the atria to finishing contracting. But, the ventricle would need to contract now but since there isn’t a direct pathway, the wave of excitations travels through purkyne fibres through atrioventricular node to base of the ventricle, this will allow the heart to contract from the apex


So in short, it’s involved in the frequency of contraction for a wide range of functionalities.

Mostly right. There are no such things as Purkyne fibres, it’s Purkinje fibres. Also, I’d say that while there is a delay in the electrical impulse travelling from the SAN to the AVN, this is not responsible for the AV delay. The AV delay occurs in the AV node, because the AV node has a slow conduction velocity, which allows the atria to contract before the ventricles contract.