If Semilunar valve remains open in venticular diastole..then Some Blood can retrace and flow backward to Ventricles from Aaorta and pulmonary artey.

Answer:

At ventricular diastole, the ventricles are relaxed and filling with blood. During this phase, the blood flows from the atria into the ventricles. There are two valves present in the heart: the mitral valve and the semilunar valve. The mitral valve is located between the left atrium and the left ventricle, while the semilunar valve is located between the left ventricle and the aorta.

Explanation:

During ventricular diastole, both the mitral valve and the semilunar valve can be closed or open depending on the specific phase of the diastole.

1. Mitral valve:
The mitral valve is also known as the bicuspid valve and consists of two cusps. It prevents the backflow of blood from the left ventricle to the left atrium during ventricular systole, when the ventricles contract to pump blood out of the heart. During ventricular diastole, the mitral valve is typically open to allow the blood to flow from the left atrium to the left ventricle.

2. Semilunar valve:
There are two semilunar valves in the heart: the aortic valve and the pulmonary valve. These valves consist of three leaflets or cusps that prevent the backflow of blood into the ventricles during ventricular diastole. The aortic valve is located between the left ventricle and the aorta, while the pulmonary valve is located between the right ventricle and the pulmonary artery. During ventricular diastole, the semilunar valves are typically closed to prevent the backflow of blood into the ventricles.

Correct answer:
The correct answer is option 'B' - semilunar valve. During ventricular diastole, the semilunar valves are closed to prevent the backflow of blood into the ventricles. The mitral valve, on the other hand, is usually open during this phase to allow the flow of blood from the left atrium to the left ventricle.