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The two upper chambers of the heart are called ______ .


Options:
A .   ventricles 
B .   atria 
C .   arteries
D .   veins
Answer: Option B
:
B
  Human heart consists of 4 chambers. The two upper chambers of the heart are called atria and the two lower chambers are called ventricles.
  Arteries are the blood vessels that carry oxygenated blood from the heart to all parts of the body.
  Veins are the blood vessels that carry deoxygenated blood back to the heart from all parts of the body. 

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