Veins

Veins are blood vessels in the body that carry deoxygenated blood back to the heart. Unlike arteries, which transport oxygen-rich blood away from the heart, veins have thinner walls and often contain valves that prevent blood from flowing backward. They play a crucial role in the circulatory system by ensuring that the blood returns to the heart for reoxygenation. The major veins include the superior and inferior vena cava, which collect blood from the upper and lower parts of the body, respectively. Proper vein function is essential for overall cardiovascular health.