MICROANATOMY

Detailed explanation-1: -Venules are the smallest veins and receive blood from capillaries. They also play a role in the exchange of oxygen and nutrients for water products. There are post-capillary sphincters located between the capillaries and venules. The venule is very thin-walled and easily prone to rupture with excessive volume.

Detailed explanation-2: -Capillaries are the smallest blood vessels in the body.

Detailed explanation-3: -Blood leaves the capillary and enters the small venules. These venules become progressively larger vessels called veins.

Detailed explanation-4: -Post-capillary venules are the smallest of the veins with a diameter of between 10 and 30 micrometres (m). When the post-capillary venules increase in diameter to 50m they can incorporate smooth muscle and are known as muscular venules.

Detailed explanation-5: -Venules. Venules in the upper and mid dermis usually run in a horizontal orientation. The diameter of the postcapillary venule ranges from 12 mm to 35 mm. Collecting venules range from 40 mm to 60 mm in the upper and mid dermis and enlarge to become 100 to 400 mm in diameter in the deeper tissues.