A) lower lateral wall of right atrium
B) upper lateral wall of right atrium
C) upper lateral wall of left atrium
D) lower lateral wall of left atrium
Correct Answer: B
Solution :
SA node (Sinu Atrial node, pace-maker) is located in upper lateral wall of right atrium. The contraction of atria is initiated and activated by SA node which spreads wave of contraction across the walls of atria via muscle fibres at regular intervals. AV node, (Atrio-Ventricular node-pace setter) is localled in lower lateral wall of right atrium. The wave of contraction originated by SA node are transmitted to all parts of ventrically via bundle of His and Purkinjes fibres by AV node.
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