Just simply mentioning the structure:
Arteries
High blood pressure (not sure if that counts as structure)
Thick outer wall
Thick layer of elastic-muscle fibre
Narrow central tube (lumen)
Smooth lining so no obstruction of blood flow
Veins
Low blood pressureThin outer wallThin layer of inelastic muscleWide central tube (lumen)Have flaps of valves
Capillaries
One cell thick wall
Highly branched networks
Pores in the walls between cells
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There are three varieties of blood vessels: arteries, veins, and capillaries. During blood circulation, the arteries carry blood away from the heart. The capillaries connect the arteries to veins. Finally, the veins carry the blood back to the heart
no it is an extension of the lung used to transport blood
the walls of lymphatic vessels are similar to those of veins
artery
Capillaries service cells, arteries and veins transport blood to and from capillaries, respectively.