Zoology-Heart & Circulation
NEET Zoology Heart & Circulation MCQ Question
Type: MCQ-fact-Hard-Class 11
What structure in the heart is referred to as the pacemaker?
A
Sino-atrial node (SAN)
B
Atrioventricular node (AVN)
C
Left ventricle
D
Right atrium
Correct Answer
Option A
Detailed Explanation
The sino-atrial node (SAN) is identified as the pacemaker of the heart, responsible for initiating and maintaining the rhythmic contractile activity of the heart, as stated in the NCERT context.
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