The upper chambers of the heart are the A. Ventricles B. Atria C. Both A & B D. None of the above

The correct answer is: B. Atria

The atria are the upper chambers of the heart. They are responsible for receiving blood from the body and lungs and then pumping it to the ventricles. The ventricles are the lower chambers of the heart. They are responsible for pumping blood out of the heart to the body and lungs.

A. Ventricles are the lower chambers of the heart. They are responsible for pumping blood out of the heart to the body and lungs.

C. Both A & B is incorrect because the atria are not the ventricles.

D. None of the above is incorrect because the atria are the upper chambers of the heart.