Veins
Veins return blood to the heart. Superficial veins lie under the skin, deep veins accompany arteries, and valves in many veins prevent backflow.
The atlas models this system as interactive 3D geometry (toggle it in the Systems panel).
Open the 3D atlasStructures
Common questions
What is the difference between arteries and veins?
Arteries carry blood away from the heart and have thicker muscular walls; veins carry blood toward the heart, have thinner walls and often contain valves.