Valves in the circulatory system prevent blood from flowing into the wrong compartments. Valves also regulate the amount of blood that can be held in one compartment of the heart over a certain period.
Valves are found in the heart and in some veins.
the circulatory system is the way it keeps your heart pumping
veins
The valves stop the blood flowing backwards through the circulatory system.
To maintain the flow of blood in one direction
Poriferans do not have distinct circulatory system. Instead water flow system support all these functions like circulatory, respiratory, excretory etc.
Help please!! :( right now PLEASE
circulatory system
the heart and the veins
So blood doesn't flow backwards.
tom dunsdon
The valves keep blood flowing in one direction. And there are even valves in the veins. The system is called a circulatory system and the system must keep going in a circle to function properly.