Question

what is SA note? Why it is called pacemaker of heart ❤️?

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Answer 1

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The cells of the SA node at the top of the heart are known as the pacemaker of the heart because the rate at which these cells send out electrical signals determines the rate at which the entire heart beats (heart rate).

Answer 2

Answer:

heart is a muscular part in body. ye jab tot tha hai tho bhot dard hota hai.