NEETZoologyBody Fluids and Circulation
What is the function of the semilunar valves during ventricular diastole?
Options
- ATo allow the backflow of blood into the ventricles
- BTo prevent the backflow of blood into the ventricles
- CTo increase the ventricular pressure
- DTo open the tricuspid and bicuspid valves
Correct answer
B. To prevent the backflow of blood into the ventricles
Step-by-step solution
As the ventricular pressure increases further, the semilunar valves guarding the pulmonary artery (right side) and the aorta (left side) are forced open, allowing the blood in the ventricles to flow through these vessels into the circulatory pathways. The ventricles now relax (ventricular diastole) and the ventricular pressure falls causing the closure of semilunar valves which prevents the backflow of blood into the ventricles.