Biology Body Fluids and Circulation Structure Of Heart, Heart Beat, Conducting System Single Correct MCQ
Published on: August 12, 2026

Where is the pace maker situated :-

A
In left auricle near opening of pulmonary vein
B
In right auricle near eustachian valve
C
On inter - auricular septum
D
On inter-ventricular septum

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The correct answer is:
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Sino-atrial node is the natural pacemaker of the heart. These are a group of small, flattened and ellipsoid strip cardiac muscle fiber situated in the upper lateral wall of the right atrium near the Eustachian valve (valve of the inferior vena cava).

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