NEET Zoology Heart & Circulation MCQ Question
What is the primary purpose of the semilunar valves in the heart?
To prevent backflow of blood into the ventricles
To allow the flow of blood from atria to ventricles
To facilitate oxygenation of blood in the lungs
To increase the heart rate during exercise
Correct Answer
Detailed Explanation
The semilunar valves are located at the exits of the ventricles and prevent the backward flow of blood into the ventricles, ensuring unidirectional blood flow from the heart. This is highlighted in the NCERT content that states the valves in the heart allow blood flow only in one direction.
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