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How Veins and Arteries Work in Human Body

    • 15 posts
    August 2, 2015 2:01:33 AM PDT

    Veins are the blood vessels that carry deoxygenated blood away from the various body parts towards the hearts for oxygenation of blood. Veins are mostly flexible as they have to bear pressure of blood. Veins consist of three layers that differ due to its composition that is different for every layer. Vein function is actually very  much important in human body. As soon as blood is propelled to all body parts and tissue have received  their oxygen requirement blood is having lower levels of oxygen in it, so it is directed back to the heart for oxygenation so that tissues might be able to fulfill its oxygen necessity. Veins differ in its length, longest vein of the human body is the vein that is present in the lower limb is the great saphenous vein that is present in the medial side of leg and thigh. It is originating from foot and reaches the upper part of thigh afterwards gave supply to groin. Umbilical vein is established only during fetal life. In fetal life its purpose is reverse to other veins  of the body, it carries oxygenated blood instead of de-oxygenated blood from the placenta. In a week later to birth this vein is disintegrated, its place is occupied by  a fibrous thread like structures .  Compression  applied by  blood to  this vein is mostly  20 mm Hg in normal conditions. Certain diseases that are associated to new born this vein will act as a site specialized for transporting blood. Anatomy of veins will show its construction. Veins are prepared up of three layers as