The SA node spontaneously generates electrical impulses at a regular rate, determining the heart's rhythm. This impulse spreads through the atria, causing them to contract, and then travels to the Atrioventricular (AV) node.
The "Pace Maker" is also knows as
Asked in UPPSC Upper Mains 2007 · Topic: Circulatory System (Conduction System of the Heart: SA node, AV node, ECG)
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