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Heart beat regulation
2 cm diameter
Pacemakers uses electrical impulses, delivered by electrodes contacting the heart muscles, to regulate the beating of the heart. The primary purpose of a pacemaker is to maintain an adequate heart rate. In 2005, Dr. Carson Beckett offered the Athosian Charin a pacemaker because her heart beat in an untimely fashion. While it would have added years to her life, she refused. (SGA: "Critical Mass")