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Pace maker (S.A. Node) of the heart is situated

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Pace maker (S.A. Node) of the heart is situated
A. In wall of right atrium close to eustachian valve
B. On intra- auricular septum
C. On inter-venticular septum
D. In wall of left atrium close to the opening of pulmonary veins
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Correct Answer - A
Pace maker (SA node) which lies in the wall of the right atrium near the opening of the superior vena cava.
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