PATHOLOGY

Detailed explanation-1: -Like all fluids, blood flows from a high pressure area to a region with lower pressure. Blood flows in the same direction as the decreasing pressure gradient: arteries to capillaries to veins. The rate, or velocity, of blood flow varies inversely with the total cross-sectional area of the blood vessels.

Detailed explanation-2: -The venous side of the circulation is a low-pressure system compared with the arterial side. Pressure within the named veins is usually between 8 and 10 mmHg, and CVP is  0–6 mmHg (3, 9).

Detailed explanation-3: -Arteries have thick walls so they can handle the high pressure and velocity that expels your blood out of your heart. Veins carry blood back to your heart from the rest of your body. The pressure of the blood returning to the heart is very low, so the walls of veins are much thinner than arteries.