Blood vessel - online puzzles

The blood vessels are the part of the circulatory system, and microcirculation, that transports blood throughout the human body. There are three major types of blood vessels: the arteries, which carry the blood away from the heart ; the capillaries, which enable the actual exchange of water and chemicals between the blood and the tissues; and the veins, which carry blood from the capillaries back toward the heart. The word vascular, meaning relating to the blood vessels, is derived from the Latin vas, meaning vessel. A few structures (such as cartilage and the lens of the eye) do not contain blood vessels and are labeled.