PATHOLOGY

Detailed explanation-1: -A venule is a very small vein in the microcirculation that allows blood to return from the capillary beds to drain into the venous system via increasingly larger veins. Post-capillary venules are the smallest of the veins with a diameter of between 10 and 30 micrometres (m).

Detailed explanation-2: -Vein is a larger blood vessel that carries blood towards the heart. Venule is a smaller minute blood vessel that drains blood from capillaries to the larger veins. Vein is larger in size and the diameter is measured by millimeters. Venule is very smaller in size and the diameter is measured by micrometers.

Detailed explanation-3: -The smallest veins in the body are known as venules. Blood reaches the venules, from the arteries via the arterioles and capillaries. The venules join into larger veins which eventually carry the blood to the largest veins in the body called vena cava.