Zoology-Heart & Circulation
NEET Zoology Heart & Circulation MCQ Question
Type: MCQ-fact-Hard-Class 11
What is the role of the sino-atrial node (SAN) in the heart?
A
It generates action potentials for heart contractions.
B
It regulates blood flow through the coronary vessels.
C
It serves as a valve to prevent backflow of blood.
D
It connects the atria to the ventricles directly.
Correct Answer
Option A
Detailed Explanation
The sino-atrial node (SAN) generates an action potential which stimulates both atria to contract, initiating the rhythmic activity of the heart.
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