NEET Zoology Heart & Circulation MCQ Question
A diagram shows the heart with various labeled parts: A is the sino-atrial node, B is the atrio-ventricular node, and C is the atrio-ventricular septum. Which part is responsible for initiating and maintaining the rhythmic contractile activity of the heart?
Sino-atrial node
Atrio-ventricular node
Atrio-ventricular septum
Ventricular walls
Correct Answer
Detailed Explanation
The sino-atrial node (SAN) is responsible for initiating and maintaining the rhythmic contractile activity of the heart, acting as the pacemaker.
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