Classify different types of blood vessels in humans. On what bases do you classify blood vessels?

Explanation

1) These are three types of blood vessels called arteries, veins and capillaries present in humans.
2) These blood vessels are classified on the basis of thickness of walls, valves, capicity to retain shape when blood is absent, direction of blood flow, pressure in the vessel, type of blood transported, type of blood carried by pulmonary artery or vein.