Part 1 · The Heart and Circulation
Same concept, other depth: Clinical Reasoning →
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A small cluster of cells in the right atrium — the SA node, the heart's natural pacemaker — fires on its own about 60–100 times a minute. The spark spreads across the atria, pauses briefly at the AV node (so the atria finish emptying), then races down to the ventricles, which squeeze together.
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