Define pacemaker
From the lesson circulatory system
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A pacemaker is a heart like machine which does the job of keeping the person alive by circulating blood
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A pacemaker is a small device that's placed in the chest or abdomen to help control abnormal heart rhythms. This device uses electrical pulses to prompt the heart to beat at a normal rate. Pacemakers are used to treat arrhythmias (ah-RITH-me-ahs). Arrhythmias are problems with the rate or rhythm of the heartbeat.
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