Question

is sA node called heart of heart can explain why

Answer 1

hYe mate
here is ans

because it contains a group of cells in the wall of the right atrium that have the ability to spontaneously initiate the electrical impulse that leads to the contraction of the heart.

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Answer 2

Here is your answer .......

the sinoatrial node also known as sinus node is a group of cell located in the Wall of the right atrium of the heart