Blood Vessel Network in Humans

The human vascular network is a system of channels (pipes) that transport blood from the heart throughout the body and back to the heart. 

This network is a very complex and long, closed "highway," consisting of millions of small, interconnected vessels. 

Major Types of Vessels 

Arteries: carry oxygen-rich blood from the heart to organs and tissues (except the pulmonary artery, which carries blood to the lungs). 

Veins: carry oxygen-poor blood (or oxygen-rich blood from the lungs) back to the heart. 

Capillaries: the smallest vessels connecting arteries and veins, where the exchange of oxygen, nutrients, and metabolic wastes between the blood and the body's cells occurs. Main Functions of the Vascular Network Transport oxygen and nutrients from the heart/blood to all body tissues. 

Transport hormones and protective substances (such as antibodies), and remove carbon dioxide and metabolic wastes

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