A) AV node
B) SA node
C) AV bundle
D) none of these
Correct Answer: B
Solution :
SA node is a small flatened and ellipsoidal mass of self excitatory nodal fibres embeded in the wall of right atrium near the opening of right anterior vena cava. Fibres of this node are continuous with the normal cardiac muscle fibres of right atrium. These spontaneously generate the contraction impulse, therefore SA node is called pacemaker.
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