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Heart Chambers, Valves, Vessels, Wall and Conduction System. The heart is made up of four chambers. The upper two chambers are called atria (singular: atrium) and the lower two are known as ventricles (singular: ventricle).
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A is left atrium, B is valve , C is left ventricle, D is super venacava, E is right atrium ,F is pulmonary valve, G is tricuspid valve
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