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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.
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