Examlex
Generally researchers do not use a margin of error over:
Veins
Blood vessels that carry blood towards the heart.
SA Node
Sinoatrial Node, the natural pacemaker of the heart located in the right atrium, responsible for initiating the heart's electrical impulses.
Pacemaker
An electronic device implanted in the body to regulate the heartbeat, used primarily in conditions where the heart's rhythm is abnormally slow.
Cardiac Conduction
The system of electrical signals that initiate and regulate the heart's rhythm and beat.
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