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Types of blood vessels

03 May

There are three types of blood vessels in the body : arteries, veins and capillaries.


Blood Vessels – are intricate networks of hollow tubes that transport blood throughout the entire body.

Arteries:
These blood vessels transport blood away from the heart. Arteries are thick, muscular walled structures compared to veins as they are designed to accommodate the high flow and pressures exerted by the force delivered by the heart. In larger arteries, e.g.Aorta, more elastic tissue is contained within the tunica media but has less smooth muscle.
Arterioles:
Smaller diameter blood vessels with thin muscular walls that extend and branch out from an artery and leads to capillaries. These vessels are the primary site of vascular resistance.
Capillaries:
Smallest of a bodies blood vessels, measuring just 5-10 μm in diameter. Capillaries connect arterioles and venules. The walls of the capillaries are only one cell thick which enables the interchange of water, oxygen, carbon dioxide, nutrients and waste products from the blood and surrounding tissues.
Venules:
A small blood vessel that drains deoxygenated blood from the capillary beds to return to the larger blood vessels called veins. Many venules join to form a vein.
Veins:
These vessels transport blood towards the heart. The majority of veins carry de-oxygenated blood except for the pulmonary vein which carries oxygen rich blood from the lungs back to the left atrium.

 

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