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gravity for those above your heart and valves for those below

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Q: What keeps blood flowing towards the heart in the largest veins?
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What do veins have which prevent blood from flowing towards the heart?

Veins have valves which stop the blood from flowing backwards


What keeps blood flowing toward the heart in the largest veins?

Valves


What is the flow of blood between the heart and lungs called?

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.


What is the muscle movement called which keeps blood from flowing towards the heart from your legs?

diastole


Blood that is flowing back to the heart is?

In the cardiac cycle, blood flowing into the heart is called the systole.


What keeps blood flowing towards the heart?

There are valves in the heart which open and close that allow the blood to be pumped in one direction only. See the related link for more information.


Which flaps of muscle keep blood from flowing backward through the heart?

Your heart keeps your blood "flowing"


What keep maths blood from flowing back into the chamber of the heart?

There are valves in the heart - and the larger blood vessels that stop the blood flowing backwards.


Valves inside the veins prevent blood from flowing where?

Heart valves help prevent blood from flowing backwards through the chambers of the heart. They open only one way to allow blood to flow through to the next chamber, and close against flow of blood from the other directon.


Why is it easier to stop blood flowing from a vein than an artery?

the blood flowing in a vein is under a lot less pressure than in an artery, generally veins carry blood back towards the heart from the various parts of your body whereas arteries are the main outlet distributers from the heart itself.


Why is the blood flowing to the heart oxygen-poor while the blood flowing to the rest of the body is oxygen-rich?

When the blood is flowing back to the heart, the blood has already given off its oxygen to the rest of the body which means it contain less oxygen concentration in the blood. and when blood is flowing from the heart to the rest of the body, the blood contains high level of oxygen because they were being given oxygen by the lungs which passes along the heart and the heart pumps it to the rest of the body.


How does the blood to a heart and lung keep flowing in the same direction?

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.