PATHOLOGY

Detailed explanation-1: -Veins make the return trip to the heart. That’s where veins come in. Veins are thin walled and have one-way valves that ensure blood flows toward the heart. The blood pressure in veins is very low. As veins get closer to the heart, they become larger and larger.

Detailed explanation-2: -Arteries and arterioles have thicker walls than veins and venules because they are closer to the heart and receive blood that is surging at a far greater pressure (Figure 2).

Detailed explanation-3: -Generally, veins carry deoxygenated blood from the body to the heart, where it can be sent to the lungs. The exception is the network of pulmonary veins, which take oxygenated blood from the lungs to the heart.