Understanding Blood Vessels: Arteries, Capillaries & Veins

There are three main types of blood vessels: arteries, capillaries, and veins.

Arteries carry oxygenated blood away from the heart to the rest of the body. They have thick, muscular walls that help to pump the blood through the body.

Capillaries are tiny, thin-walled vessels that allow for the exchange of oxygen, carbon dioxide, and other substances between the blood and the tissues.

Veins carry deoxygenated blood back to the heart. They have thinner walls than arteries and are less muscular. Veins also contain valves that help to prevent blood from flowing backward.