👉 Veins are blood vessels that carry deoxygenated blood back to the heart, and they contain thin-walled, elastic walls with one-way valves to prevent blood from flowing backward. These valves ensure that blood moves only in one direction toward the heart, despite gravity's pull. Add veins are small veins that connect capillaries to larger veins, serving as a bridge between them. They play a crucial role in maintaining proper blood pressure and circulation throughout the body.
