Circulatory System Circulatory System Tools A B The circulatory system is made of heart, blood vessels, and blood The circulatory system's job is to move the blood blood is made up of liquid and cells The liquid part of blood is called plasma Plasma carries digested food to the cells The remainder of the blood red blood cells, white blood cells, and platelets Red blood cells carry oxygen to the cells and carbon dioxide away from body cells White blood cells protect your body from disease and infection by killing germs Platelets help you stop bleeding when you cut yourself The most powerful muscle in your body heart the heart is the size of your fist Tha heart is located between your lungs the job of the heart is to pump blood through your body