The right ventricle pumps blood through the right ventricular outflow tract, across the pulmonic valve, and into the pulmonary artery that distributes it to the lungs for oxygenation. From here, blood flows through the tricuspid valve to fill the right ventricle, which is the main pumping chamber of the right heart. The right atrium, therefore, acts as a reservoir to collect deoxygenated blood. Also, deoxygenated blood from the heart muscle itself drains into the right atrium via the coronary sinus. The right atrium receives deoxygenated blood from the entire body except for the lungs (the systemic circulation) via the superior and inferior vena cavae. The left ventricle is thicker than the right ventricle as it takes more force to push blood to the body compared to the lungs.The heart consists of four chambers organized into two pumps (right and left) to provide blood flow to the systemic and pulmonary circulations. The left atrium receives oxygenated blood from the lungs and the left ventricle pushes this oxygenated blood to the body.

The right atrium receives deoxygenated blood from the body and the right ventricle pushes this deoxygenated blood to the lungs where it receives oxygen. The atria receive blood from veins and the ventricles push blood out of the heart into arteries. The heart itself needs its own blood supply for oxygen and nutrients as it is a muscle, so is supplied by the coronary arteries. 2 valves between the atria and the ventricles and 2 valves between the ventricles and the arteries that leave the heart. The right and the left side of the heart are separated by the interventricular septum. In the heart there are 4 chambers the upper 2 chambers are called the atria and the bottom two chambers are called the ventricles.

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