Zoology-Heart & Circulation
NEET Zoology Heart & Circulation MCQ Question
Type: MCQ-fact-Medium-Class 11
What is the primary role of the sino-atrial node in the heart?
A
It initiates and maintains the rhythmic contractile activity of the heart.
B
It regulates blood pressure through vasodilation.
C
It filters blood before it enters the ventricles.
D
It prevents backflow of blood during ventricular contraction.
Correct Answer
Option A
Detailed Explanation
The sino-atrial node is referred to as the pacemaker of the heart because it initiates and maintains the rhythmic contractile activity of the heart, as stated in the context provided.
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