Which statement is true regarding veins compared to arteries?

Veins often have valves to prevent blood reflux, which is a key feature that distinguishes them from arteries. The presence of these valves is crucial because veins operate under lower pressure compared to arteries, as they are responsible for returning blood to the heart rather than distributing it from the heart. These valves ensure that blood flows in one direction, preventing backflow and helping to maintain efficient circulation, especially in the limbs where blood must travel against gravity.

In contrast, arteries do not have valves because they carry blood away from the heart at higher pressure, and the flow is consistently directed forward due to this pressure. The structure of veins, including the ability to contain these valves, plays a vital role in the overall function of the circulatory system by aiding venous return and ensuring that blood is efficiently transported back to the heart.