The heart is a sophisticated pump that keeps blood moving around the body.
It carries oxygen and nutrients to all parts of the body and carries away unwanted waste products including carbon dioxide.
Within the heart, there are four chambers. The two upper chambers are the Atria and the larger lower chambers are known as the Ventricles. As your heart muscle contracts, it pushes blood through your heart. With each contraction or heartbeat, deoxygenated blood flows into the right side of the heart, which pumps it to the lungs to pick up oxygen. The oxygenated blood then returns to the left side and is then transported by the circulatory system to the tissues of the body.
There are four valves in the heart. Each valve consists of two or three flaps or cusps of tissue that open to let the blood through then seal shut to prevent backflow allowing a one-way flow of blood through the heart. The tricuspid and mitral valves are positioned between the upper and lower chambers and are attached to the heart walls by fibrous strands. The pulmonary and aortic valves are in the arteries leaving the heart and they are situated at the exits from the ventricles.