Biology / Bio 3201 · Atom · ~20 seconds
SA Node and the Cardiac Conduction System
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The sinoatrial node generates the heart's own electrical rhythm and initiates each cardiac cycle, its signal spreading through a pathway that coordinates chamber contraction timing.
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A damaged sinoatrial node can be replaced functionally by an artificial pacemaker generating the same signal.
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The rhythm originates at the sinoatrial node — nervous input adjusts rate but does not initiate each beat.