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B
Right Lower lower corner of right atrium
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C
Right upper corner of left atrium
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D
Left upper corner of right atrium
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Solution
The correct option is B Right upper corner of right atrium The sinoatrial node is present at the right upper corner of the right atrium. The node is present below the Vena Cava. It initiates the autonomous contraction of the heart muscles.
So, the correct option is 'Right upper corner of right atrium'.