Final answer:
The cardiovascular system not functioning normally in patients requiring an implanted pacemaker is the heart's electrical conduction system. An implanted pacemaker restores normal function by delivering electrical impulses to the heart muscle, mimicking the signals produced by the heart's pacemaker cells.
Step-by-step explanation:
The part of the cardiovascular system that is not functioning normally in patients requiring an implanted pacemaker is the heart's electrical conduction system. The heart's electrical conduction system is responsible for coordinating the heartbeat and ensuring that it beats in a regular rhythm. When this system is not functioning properly, it can result in abnormal heart rhythms, such as arrhythmias.
An implanted pacemaker restores normal function by delivering electrical impulses to the heart muscle. These electrical impulses mimic the signals normally produced by the heart's pacemaker cells, helping to regulate the heartbeat and maintain a regular rhythm. The pacemaker is programmed by a cardiologist to meet the specific needs of each patient, whether it's providing stimulation temporarily upon demand or on a continuous basis.
In some cases, pacemakers may also contain built-in defibrillators, which can deliver an electric shock to the heart to restore normal rhythm in the event of a life-threatening arrhythmia.