Zoology-Heart & Circulation
NEET Zoology Heart & Circulation MCQ Question
Type: MCQ-fact-Hard-Class 11
Which structure in the heart is known as the pacemaker?
A
Sinoatrial Node
B
Atrioventricular Node
C
Coronary Artery
D
Pulmonary Vein
Correct Answer
Option A
Detailed Explanation
The sinoatrial node (SAN) is responsible for initiating and maintaining the rhythmic contractile activity of the heart, thus it is referred to as the pacemaker.
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