The time duration between closure of semilunar valve and closure AV valve is

The time duration between the closure of the semilunar valve and the closure of the atrioventricular (AV) valve is known as the ventricular diastole phase of the cardiac cycle.

Here are the steps of the cardiac cycle:

1. Ventricular Diastole: This is the period when the semilunar valves close (after the blood has been ejected into the arteries) but before the AV valves close. During this time, the ventricles are relaxed and filling with blood coming from the atria.

2. Atrial Systole: This is when the AV valves are open and the atria contract to push blood into the ventricles.

3. Isovolumetric Contraction: This is the brief moment when the ventricles begin to contract, the AV valves close (marking the end of ventricular diastole), but the semilunar valves have not yet opened.

4. Ventricular Systole: This is when the ventricles contract, the semilunar valves open, and blood is ejected into the arteries.

5. Isovolumetric Relaxation: This is the brief moment when the ventricles begin to relax, the semilunar valves close, but the AV valves have not yet opened.

So, the time duration between the closure of the semilunar valve and the closure of the AV valve is the period of ventricular diastole, which is when the ventricles are filling with blood.