cardiac chambers

The heart has four chambers that work together to pump blood through the body. The two upper chambers are called atria; the right atrium receives oxygen-poor blood from the body, and the left atrium gets oxygen-rich blood from the lungs. The two lower chambers are called ventricles; the right ventricle sends oxygen-poor blood to the lungs for oxygen, while the left ventricle pumps oxygen-rich blood to the entire body. These chambers work in coordinated cycles, ensuring efficient circulation of blood, delivery of oxygen and nutrients, and removal of waste products.