Where are the anterooms of heart located?

The anterooms of the heart, also known as the atria, are located in the upper portion of the heart. There are two atria, the left atrium and the right atrium. The left atrium receives oxygenated blood from the lungs, while the right atrium receives deoxygenated blood from the body. The atria then contract, pushing the blood into the ventricles, which are the lower chambers of the heart.