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To maintain the flow of blood in one direction
Well,circulatory system is made up of BLOOD and heart.
Valves ensure the flow of blood in a single direction. Unidirectional blood flow is very important for the circulatory system to function properly. When one of the valves do not work properly, blood does not flow properly in one direction and there is going to be some backward current. This is called shunting and can have drastic consequences if not treated immediately.
blood delivers oxygen to the cells
no
Circulatory System has blood.
cardiovascular, circulatory and respiratory.
circulatory system because blood flows through your veins
A closed circulatory system
The circulatory system consists of the heart and blood vessels.
Closed circulatory system.
The open circulatory system