There are valves in the blood vessels (like a one-way door) - that stop the blood flowing backwards.
no it doesnt
so that the blood cannot flow the wrong way through the vessels
I could be wrong but, I think it would decrease your blood flow
Valves prevent the flow of blood into the wrong chamber or its backflow.
yes
the answer is know but they do have a blood flow
So that the blood dosen't flow the wrong way
They stop blood flowing the wrong way. If blood tries to go the wrong way for whatever reason, they automatically seal shut and prevent blood flow until the blood is flowing properly again.
Valves are present in veins to prevent the backward flow of blood. These valves help ensure that blood moves in only one direction toward the heart by closing when blood tries to flow in the wrong direction.
It is important for blood to flow in one direction in the heart because blood can't flow backwards because it has oxygen rich blood and poor oxygen rich blood and these to types of blood cannot mix :)
The flow or blood
Arteries have no valves to prevent the blood from flowing backwards, but it is unnecessary when the heart keeps pumping. The blood pressure is highest when the blood is leaving the heart chamber into arteries -- the heart pumping keeps blood going one-way in the arteries.