Hey There!
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Answer:
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VESSEL A:
The superior vena cava (SVC) is the superior of the two venae cavae, It is located above inferior vena cava and it returns the deoxygenated blood from the systemic circulation to the right atrium of the heart.
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VESSEL C:
The aorta is the main artery that carries blood away from your heart to the rest of your body.
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ATRIUM D:
The Left Atrium is one of the two atriums, it receives the oxygenated blood from the lungs via Pulmonary vein.
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VENTRICLE E:
The Left Ventricle is one of the two ventricles, it receives the oxygenated blood by the Left atrium through the mitral valves. From the ventricle oxygenated blood is provided to the whole body.
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VESSEL B:
Pulmonary Artery is one of the two pulmonary vessels which connect the blood heart and lung. Pulmonary Artery takes the deoxygenated blood from the Right ventricle to the Lungs from the oxygenation.
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Best Regards,
'Borz'