SA ( sinoatrial node or sinus node ) is similar type of cell or tissue because it is group of cells positioned on the wall of the right atrium. It very close to the entrance of the superior vena cava. The sinoatrial node is responsible for the rest of the heart's electrical activities. The SA node is considered the pacemaker of the heart
Connective tissues
The SA node is a crescent-like shaped cluster of myocytes divided by connective tissue, spreading over a few square millimeters.
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