The upper chambers of the heart are called and the lower chambers are called .
A
atria
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B
aorta
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C
valves
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D
ventricles
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Solution
The correct options are A atria D ventricles The human heart consists of four chambers. The upper chambers of the heart are called atria which always receive blood. The lower two chambers are called ventricles which pump the blood out of the heart to various parts of the body.