Zoology-Heart & Circulation
NEET Zoology Heart & Circulation MCQ Question
Type: MCQ-fact-Easy-Class 11
Which structure in the heart is responsible for initiating the electrical excitation of the atria?
A
Sino-atrial node
B
Atrioventricular node
C
Right ventricle
D
Left atrium
Correct Answer
Option A
Detailed Explanation
The sino-atrial node (SAN), located in the right upper corner of the right atrium, is responsible for initiating the electrical excitation of the atria, leading to their contraction.
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