A) lymph node
B) SA node
C) juxtaglomerular apparatus
D) semilunar valve
Correct Answer: B
Solution :
The heart beat originates from sinoatrial node (SA node) also called pacemaker,which lies in the wall of right atrium near the opening of superior vena cava. This can be remedied by surgical grafting of artificial pacemaker in chest of patient.
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