Biology – The heart | e-Consult

Purkinje fibres are a specialized network of cardiac muscle fibres that are responsible for rapidly conducting the electrical impulse throughout the ventricles. They form a rapid and extensive conduction system within the ventricular myocardium.

Their function is to ensure that the electrical impulse spreads quickly and uniformly throughout the ventricular muscle cells. This rapid conduction is essential for efficient ventricular contraction because it allows the ventricular muscle cells to depolarize and contract in a coordinated manner. This coordinated depolarization leads to a powerful and effective ventricular contraction, maximizing the ejection of blood into the pulmonary artery and aorta.

The Purkinje fibres are particularly important for rapid ventricular depolarization. The impulse travels rapidly through the Purkinje fibres, ensuring that the ventricles contract simultaneously. This synchronized contraction is vital for efficient pumping of blood. The rapid conduction also ensures that the ventricles contract with a high degree of force, maximizing cardiac output. Without the Purkinje fibres, ventricular contraction would be slower and less coordinated, resulting in a significant reduction in cardiac output.