What are upper two chmbers of he heart?

The upper two chambers of the heart are called the atria, consisting of the left atrium and the right atrium. The right atrium receives deoxygenated blood from the body through the superior and inferior vena cavae, while the left atrium receives oxygenated blood from the lungs via the pulmonary veins. These chambers play a crucial role in collecting blood before it is sent to the lower chambers (ventricles) for pumping to the lungs and the rest of the body.