right atrium left atrium right ventricle left ventricle superior vena cava inferior vena cava aorta pulmonary trunk mitral valve pulmonary valve tricuspid valve aortic valve pulmonary vein RBC approaches the heart through the following vessel: First chamber it enters: First valve it passes through: Second chamber it enters: Second valve it passes through: Vessel it leaves heart through: Left and right pulmonary arteries "lungs* Vessels it returns to the heart through: 3rd chamber it enters: Next valve it passes through: 4th chamber it enters: Last valve it passes through: Vessel it leaves heart through: Systemic circulation

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