Well, a blood vessel is a conduit. It's a pipe that essentially allows the movement, the flow of blood through our body. And the blood is this fluidlike substance that consists of many things. It contains the blood plasma which has the ions, the electrolytes, water as well as proteins such as albumin. We also have red blood cells inside our blood that carry the oxygen and we have different waste products such as urea ammonia as well as carbon dioxide. Now, what exactly is the purpose, what exactly is the function of the cardiovascular system?