Respuesta :

SA node (sinoatrial node) – known as the heart's natural pacemaker. The impulse starts in a small bundle of specialized cells located in the right atrium, called the SA node. The electrical activity spreads through the walls of the atria and causes them to contract. This forces blood into the ventricles.
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Answer:

sinoatrial hub – known as the heart's characteristic pacemaker. The motivation begins in a little bundle of specialized cells found within the right chamber, called the SA hub. The electrical action spreads through the dividers of the atria and causes them to contract. This powers blood into the ventricles

I put it in my own words so you don't get it wrong. Hope this helps :)

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