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There are valves in the heart - and the larger blood vessels that stop the blood flowing backwards.
A specific chamber? It's valves and each one has a different name. I'll list the chamber and the valve which stops 'backflow':- Right Atrium: Tricuspid valve Right Ventricle: Pulmonary valve Left Atrium: Mitral valve Left Ventricle: Aortic valve The valves basically open when the relevant chamber is pumped but when pressure goes back towards the chamber they snap shut, stopping blood from going back through the heart/circulatory system.
In the cardiac cycle, blood flowing into the heart is called the systole.
Your heart keeps your blood "flowing"
the heart
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.
The right chamber pumps blood to the lungs to get oxygen.
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.
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.
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.
To prevent the backflow of blood into the heart during the period of time where the heart doesn't beat (diastole) and to segment the heart into chambers.The valves allow the flow, and prevent the backflow, of blood in the heart chambers, ensuring that the muscle contractions force the blood in the proper direction.