Question

For how much time does the pacemaker give electrical signals

Answer 1

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$\huge\green{\mathbb{Pacemakers ,}}$A pacemaker is a small electrical device, fitted in the chest or abdomen. It's used to treat some abnormal heart rhythms (arrhythmias) that can cause your heart to either beat too slowly or miss beats.

Some pacemakers can also help the chambers of your heart beat in time.

Answer 2

it is used to give the signals so that heart work properly.