Human circulatory system is

Human circulatory system is a transportation device of the most perfect and amazing in the world (having a long-term vessel exceeds all railroads in the world from 100 thousand to 150 thousand km)
Circulatory System - Tasked to prepare and circulate blood throughout the body tissues that need it. This system will remove the damaged cells and replacing them with forming new cells (red blood cells, one million cells per second. In every minute, the circulatory system is able to distribute 5 liters of blood throughout the body (day and nights distributed over seven thousand liters of bloodBLOOD.
Blood is a tissue composed of a liquid called plasma intercellular parts and in which there is an element of solid blood cells. Blood is the fluid contained in the heart and blood vessels. Whole blood volume about 1/12 the human body weight or roughly 5 liters (55% liquids; 45% of blood cells).