Structure of Blood Vessels
Despite their differing functions, blood vessels share a similar basic structure which comprises three consecutive layers:
- Tunica Intima (Innermost): It is the innermost layer of blood vessels which is composed of endothelial cells that provide a smooth surface for blood flow. It prevents the clot formation and facilitates the nutrient exchange.
- Tunica Media (Middle): It is the middle layer, which primarily consists of smooth muscle cells and elastic fibres. This layer is responsible for regulating the diameter of the blood vessel, thus controlling blood pressure and flow.
- Tunica Adventitia (Outermost): It is the outermost layer which is composed of connective tissue that provides structural support and flexibility to the blood vessel.
Capillaries consist of a single layer of cells called endothelial cells with a supporting layer of subendothelium which consists of a connective tissue along with a basement membrane. When blood vessels connect a region of diffuse vascular supply called anastomosis is formed. Anastomosis provide alternative ways for blood to flow in case of blockages.
What are Blood Vessels?
Blood Vessels are the components of the circulatory system through which the blood circulates in the body. The function of blood vessels is to deliver oxygen, nutrients, and essential substances to every cell in the body. Blood vessels create a complex network throughout the body, allowing for a continuous flow of blood from the heart to all areas and back again.
There are three major types of blood vessels. Understanding the structure of blood vessels is essential for grasping human physiology and the occurrence of common blood vessel disorders. It is known that the major function of blood vessels is to carry blood but it is essential to know the difference between the artery, vein, and capillaries; which are the different types of blood vessels.
Table of Content
- What are Blood Vessels?
- Types of Blood Vessels
- Common Blood Vessel Disorders
- Difference between Artery, Vein and Capillary
- Conclusion: What are Blood Vessels?