How The Cardiovascular System works
The heart is made up of two circuits, and blood flows through it twice. The pulmonary circulation carries blood into the lungs to remove carbon dioxide. Oxygen is then taken up by red blood cells through haemoglobin.
The systemic circulation circulates blood throughout the entire body in order to provide oxygen. It then returns blood deoxygenated and containing carbon dioxide, as well as waist material to the right-side heart.
The heart’s top connects with the major blood vessels of the body. This includes the vena-cava, which transports deoxygenated lungs and tricuspid, pulmonary and mitral valves. The heart is connected to all the blood vessels, including the vena cava which transports the deoxygenated lungs blood, and to the top, where the aorta connects.
The arteries are fed by the aorta of the heart. This is the main arterial. Blood travels from the arteries into the smaller capillaries. Through the capillary network, blood can reach all parts of your body and provide nutrients.
The blood is then re-oxygenated and returns to your heart via the veins. The venacava, a larger vein formed from the union of several smaller veins, returns deoxygenated blood to your heart.
The heart then pumps this deoxygenated oxygenated blood into the lungs. The right side is filled with blood as the heart relaxes, between each contraction. As the heart relaxes, the right side fills with blood.