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? Well, the cardiovascular system is used to actually bring and deliver the nutrients and electrolytes to the cells, the tissues and organs found inside our body and the blood. Our cardiovascular system also takes in the waste products produced by the cells and it brings those waste products to the proper organ of the body such as our skin and kidneys that are involved in excretion of those waste products. Now our cardiovascular system is said to be a closed cardiovascular system.