Zoology-Cardiac Cycle
NEET Zoology Cardiac Cycle MCQ Question
Type: MCQ-diagram based-Hard-Class 11
Consider a diagram of the cardiac cycle showing the phases of ventricular systole and diastole. Which structure is responsible for preventing the backflow of blood from the ventricles into the atria during ventricular contraction?
A
Bicuspid and tricuspid valves
B
Semilunar valves
C
Inter-ventricular septum
D
Atrial walls
Correct Answer
Option A
Detailed Explanation
During ventricular systole, the bicuspid and tricuspid valves prevent backflow of blood into the atria by closing tightly due to the increased pressure in the ventricles.
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