What are the upper chambers of the heart?

What are the upper chambers of the heart?

• A. Ventricles
• B. Atria
• C. Septum
• D. Auricles

Answer: (B)

The upper chambers are the atria. The heart has two atria at the top and two ventricles at the bottom. The atria receive blood returning to the heart—right atrium from the body via the vena cavae, left atrium from the lungs via the pulmonary veins—and then pass it to the ventricles through the atrioventricular valves. The ventricles, in turn, pump blood out to the lungs and to the rest of the body. The septum is simply the wall that divides the left and right sides, not a chamber, and auricles are the small ear‑like extensions of the atria, not the primary chambers themselves. So the upper chambers are the atria.

The upper chambers are the atria. The heart has two atria at the top and two ventricles at the bottom. The atria receive blood returning to the heart—right atrium from the body via the vena cavae, left atrium from the lungs via the pulmonary veins—and then pass it to the ventricles through the atrioventricular valves. The ventricles, in turn, pump blood out to the lungs and to the rest of the body. The septum is simply the wall that divides the left and right sides, not a chamber, and auricles are the small ear‑like extensions of the atria, not the primary chambers themselves. So the upper chambers are the atria.