NEET Zoology Heart & Circulation MCQ Question
Imagine a diagram showing the structure of the heart with labels for various parts. Which of the following is the function of the sino-atrial node (SAN) located in the right atrium?
Initiates and maintains the rhythmic contractile activity of the heart.
Prevents the backward flow of blood into the atria.
Facilitates the exchange of gases in the pulmonary circulation.
Regulates the opening and closing of the semilunar valves.
Correct Answer
Detailed Explanation
The sino-atrial node (SAN) is responsible for initiating and maintaining the rhythmic contractile activity of the heart and is known as the pacemaker.
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