help blood clot following wounds, so that wounds stop bleeding. Most of blood is made of the yellow-colored liquid . blood cells are part of the immune system and fight off infections. Blood must reach every single cell in the body. In order to do this, blood flows through the , which are small blood vessels, often only 1 cell thick. Most carry oxygen-rich blood away from the heart and are coded red in anatomy diagrams. Blue-colored blood vessels indicate low-oxygen blood and are called . The is the main artery out of the heart, taking freshly-oxygenated blood from the left ventricle to deliver to the rest of the body. The right ventricle pumps blood to the lungs through the ; this is typically colored blue even though it carries blood away from the heart. is a waste gas that is carried by blood back to the lungs. Respond to the following based on your reading. Write out the process of blood flowing through the heart. Begin with low-oxygen blood returning to the heart from the body. Your response should include the terms: pulmonary artery, aorta, pulmonary vein, superior vena cava, inferior vena cava, left atrium, right atrium, left ventricle, right ventricle, mitral valve, tricuspid valve.