what is sino atrial node?
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Explanation:
the sinoatrial node (also known as the SA node or the sinus node) is a group of cells located in the wall of the right atrium of the heart.
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Answer:
it is also known as Pace maker of the heart,,it is present below the superior vena cava,,,it regulates the signals to close the valves of left and right atrium...these signals are then transferred to AV nodes..
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