What is the function of the Purkinje Fiber System?

The Purkinje Fiber System plays a crucial role in the heart's conduction system by ensuring that electrical impulses are efficiently spread among the ventricular muscle fibers. This network of fibers is specialized for rapid conduction, allowing the electrical signals that provoke heart contractions to be transmitted quickly throughout the ventricles. As a result, this coordinated electrical activity enables the ventricles to contract in a synchronized manner, which is essential for effective pumping of blood to the lungs and the rest of the body.

In contrast, the other functions listed do not pertain to the Purkinje Fiber System. Controlling heart rate involves multiple components including the sinoatrial node and autonomic nervous system, while hormone secretion for metabolism is handled by organs such as the pancreas and thyroid. Waste filtration is a function of the kidneys rather than any component of the cardiac conduction system. Each of these systems operates independently and serves distinct physiological roles.