What are the types of blood vessels?

Multiple. Arteries, arterioles, cappilaries, veinules, veins.
Blood Vessel Types. Arteries, veins, and capillaries. Arteries carry oxygen rich blood away from the heart & toward the organs. Veins carry oxygen poor blood away from the organs and back to the heart & lungs to get re-oxygenated. The capillaries are the connecting blood vessel that travel between arteries and veins, allowing the blood exchange between the two networks.

Related Questions

What type of doctor treats blood vessel diseases?

Depends. If you mean vasculitis, then rheumatologists. If it's a blocked artery, then it could be a vascular surgeon, cardiologist, interventional radiologist, heart surgeon, etc.