What is the condition of the heart valves during the contraction of the ventricle?

The valves overlap. This is essential in the blood circulation process. Blood moves through the vessels in one direction. The heart is a pump that works rhythmically and by pushing blood out of the ventricle, it makes it move. But if all the valves are open during contraction, then the blood will be pushed out in two directions. Because of this, the movement of blood in a circle will be impossible. This process of reduction is quite complex and the life of humans and most animal organisms that have a circulatory system depends on it.