What event occurs when the impulse travels along the Purkinje fibres?

When the impulse travels along the Purkinje fibres, it is primarily responsible for stimulating the contraction of the ventricles. This electrical activity ensures that the ventricles contract in a coordinated manner to effectively pump blood out of the heart. The Purkinje fibres are specialized conducting fibres located within the ventricular muscle that facilitate rapid conduction of the electrical impulse, allowing for synchronized contraction.

The coordinated contraction of the ventricles is crucial for maintaining efficient blood circulation throughout the body. This phase occurs after the atria have already contracted, filling the ventricles with blood. As the impulse reaches the Purkinje fibres, it leads to a strong and effective ventricular contraction, ensuring that the heart can maintain adequate blood flow under various physiological conditions. Understanding this mechanism highlights the role of the electrical conduction system in the heart's functionality and the seamless process necessary for effective cardiopulmonary circulation.