Circulatory System Diagram may be seen strictly as a blood distribution network. But, sometimes the circulatory system is considered to be composed of the cardiovascular system (It distributes blood) and the lymphatic Circulatory System. This is an organ system passing nutrients (such as amino acids, electrolytes). While humans, as well as other vertebrates, have a closed cardiovascular system (that is, the blood never leaves the network of arteries and capillaries), some invertebrates are considered to have an open cardiovascular system. Two types of fluids move through the Circulatory System Diagram, one is blood, and the other is lymph. The cardiovascular system is composed of the blood, heart, and the blood vessels. The circulatory system is the joint production of the cardiovascular and the lymphatic system.