ajay2017
New Member, Female, 28
- ajay2017 was last seen:
- May 3, 2017
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About
The heart beat (contraction) begins when an electrical impulse from the sinoatrial node (also called the SA node or sinus node) moves through it. The SA node is sometimes referred to as the heart's "natural pacemaker" because it initiates impulses for the heartbeat.
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