Arteries have thick walls with muscle tissue. Veins have thinner walls and use valves to keep your blood flowing. Artery vs Capillary. Arteries carry blood from your heart to your organs.

Capillaries are very tiny blood vessels — so small that a single red blood cell can barely fit through them. They help to connect your arteries and veins in addition to facilitating the exchange ...

For example, a capillary is microscopically thin to allow gases to exchange, the arteries are tough and flexible to cope with high pressure blood flow and the veins contain valves to prevent the ...