In the heart, which chamber is involved in receiving blood from the circulatory system and moving it into the ventricles?

• A. Ventricle
• B. Aorta
• C. Atrium
• D. Pulmonary trunk

Answer: (C)

The atria are the receiving chambers. They collect blood returning to the heart from the circulation and then pass it into the ventricles through the atrioventricular valves. The right atrium gets blood from the body, and the left atrium gets blood from the lungs, preparing it for transfer to the ventricles to be pumped onward. The other options don’t fit this role: ventricles push blood out of the heart, the aorta and pulmonary trunk carry blood away from the heart rather than toward the ventricles.