NEET Zoology Heart & Circulation MCQ Question
Which of the following statements about the heart and circulation are correct?
The sino-atrial node regulates heart rate and is located in the right atrium.
The atrio-ventricular node is responsible for the contraction of the atria.
The semilunar valves prevent backflow of blood into the ventricles.
The pulmonary circulation carries oxygenated blood from the lungs to the heart.
Correct Answer
Detailed Explanation
The sino-atrial node, located in the right atrium, is responsible for regulating heart rate. The semilunar valves prevent backflow into the ventricles, while the pulmonary circulation carries deoxygenated blood to the lungs, not oxygenated blood.
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