The function of the cathode in pacing circuits is to:

The cathode in pacing circuits serves as the point through which electrical current is delivered to the body, specifically into the myocardial tissue. When a pacemaker generates an impulse, the cathode is the electrode that emits the negative charge, allowing for the flow of current through the surrounding tissue, which stimulates the heart to contract. This process is essential for establishing and maintaining a controlled heart rhythm, particularly in patients with conditions that lead to bradycardia or other types of arrhythmias. When considering the function of the cathode, it is critical to understand that it acts as the return path for the electrical current, which is vital for ensuring effective stimulation of the heart muscle and facilitating the overall pacing mechanism.