Blood courses along veins back towards the heart.
The veins have one way valves to prevent back flow.
Venous blood from below the heart drains into the inferior vena cava. Venous blood from above the heart drains into the superior vena cava. These empty into the right atrium.
In the cardiac cycle, blood flowing into the heart is called the systole.
Your heart keeps your blood "flowing"
There are valves in the heart - and the larger blood vessels that stop the blood flowing backwards.
The flow of blood from the heart to the lungs and back to the heart is called the pulmonary circulation.The blood flowing from the heart to the lungs would be deoxygenated and blood flowing towards the heart from the lungs would be oxygenated.
There are two ways that blood is kept flowing in the same direction. The heart is pumping it in that direction, and blood vessels contain valves which prevent blood from flowing in the wrong direction.
Veins have valves which stop the blood from flowing backwards
heart valves
yes
The heart is the organ that keeps the blood flowing. Valves in the heart ensure the flow is only in one direction.
2 of these valves (one on each side) stop blood from flowing back into the atria chambers of the heart when the heart is contracting and expelling blood. The other two are there to stop blood flowing out of the ventricles when the heart is filling up with blood. One stops blood flowing through the aorta to supply the body and the other stops it flowing through the pulmonary artery to the lungs.
Arteries
The valve