Veins are blood vessels that carry blood toward the heart. They typically transport deoxygenated blood from the tissues back to the heart, except for the pulmonary veins which carry oxygenated blood.
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Veins have valves that prevent backflow of blood and ensure it flows in one direction toward the heart.
Veins are part of the low-pressure system within the circulatory system compared to arteries.
The largest vein in the body is the inferior vena cava, which carries blood from the lower body to the heart.
Venous walls are thinner and less muscular than arterial walls due to lower pressure requirements.
Varicose veins occur when vein valves malfunction, causing blood to pool and veins to enlarge.