PATHOLOGY

Detailed explanation-1: -In general, blood pressure decreases from arteries to veins, and this is because of the pressure overcoming the resistance of the vessels. The greater the change in resistance at any point in the vasculature, the greater the loss of pressure at that point.

Detailed explanation-2: -Similar to the valves associated with the heart, yet dissimilar from the arteries, veins contain valves to ensure that the blood flows in only one direction, toward the heart. (Arteries don’t require valves because pressure from the heart is so strong that blood is only able to flow in one direction.)