Question

Which upper chamber of the heart contains oxygen-rich blood?

the right atrium
the left atrium
the right ventricle
the left ventricle

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Answer 1

the left atrium
explanation : he left atrium receives blood from the lungs, which is rich in oxygen.
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Answer 2

left atrium

Oxygen-rich blood flows from the lungs back into the left atrium (LA), or the left upper chamber of the heart, through four pulmonary veins. Oxygen-rich blood then flows through the mitral valve (MV) into the left ventricle (LV), or the left lower chamber.