What are the 2 connecting chambers of heart?

The two connecting chambers of the heart are the atria (singular: atrium). The heart has four chambers in total: two atria and two ventricles. The atria are located in the upper part of the heart and receive blood from the body (right atrium) and the lungs (left atrium). The ventricles are located in the lower part of the heart and pump blood out to the body (right ventricle) and the lungs (left ventricle).