Diagram of the Human Circulatory System (Infographic) The systemic circulation is a major portion of the circulatory system. The network of veins, arteries and blood vessels transports oxygenated blood from the heart, delivers oxygen and nutrients to the body’s cells and then returns deoxygenated blood back to the heart.
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The human circulatory system circulates blood through two loops (double circulation) – One for oxygenated blood, another for deoxygenated blood. The human heart consists of four chambers – two ventricles and two auricles. The human circulatory system possesses a body-wide network of blood vessels.