A) having \[90%\]blockage of the three main coronary arteries
B) having a very high blood pressure
C) with irregularity in the heart rhythm
D) suffering from arteriosclerosis
Correct Answer: C
Solution :
SA node (Sino-Atrial node) sets the basic pace of the heartbeat, hence it is called pacemaker which is a bundle of modified cardiac muscles. It is generally implanted subcutaneously and connected to heart in patients who have irregularity in their heart rhythm.
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