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Within the heart the pacemaker potential is nothing but the voltage that is created by an artificial electronic pacemaker or something known as a SA node which is used to drive the heart's rhythmic firing. It is this very pacemaker potential that brings or gets the membrane potential to what is called the threshold potential and initiates or starts an action potential. The heart has a number of pacemakers which are also called autonomic foci, each of these fires at its very own intrinsic rate. They are known as the SA node, the Atrial foci, the junctional foci and the ventrical foci. They fire at 80-100, 60-80, 40-60 and 20-40 beats per minutes respectively in the order specified. In a normal healthy heart it is only the SA node intrinsic rate that is at all observable.
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