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  2. Vein - Wikipedia

    en.wikipedia.org/wiki/Vein

    Deep veins are deeper in the body and have corresponding arteries. Perforator veins drain from the superficial to the deep veins. [16] These are usually referred to in the lower limbs and feet. [17] Superficial veins include the very small spider veins of between 0.5 and 1 mm diameter, and reticular or feeder veins. [18] Venous plexuses

  3. Circulatory system - Wikipedia

    en.wikipedia.org/wiki/Circulatory_system

    In vertebrates, the circulatory system is a system of organs that includes the heart, blood vessels, and blood which is circulated throughout the body. [1] [2] It includes the cardiovascular system, or vascular system, that consists of the heart and blood vessels (from Greek kardia meaning heart, and Latin vascula meaning vessels).

  4. Blood vessel - Wikipedia

    en.wikipedia.org/wiki/Blood_vessel

    In humans, arteries do not have valves except for the two 'arteries' that originate from the heart's ventricles. [ 9 ] Early estimates by Danish physiologist August Krogh suggested that the total length of capillaries in human muscles could reach approximately 100,000 kilometres (62,000 mi) (assuming a high muscle mass human body, like that of ...

  5. Complications of prolonged standing - Wikipedia

    en.wikipedia.org/wiki/Complications_of_prolonged...

    Varicose veins are veins that have become enlarged and twisted, especially within the legs, ankles and feet of an affected individual. [4] When standing, gravity pulls the blood downwards to the lower part of the body. Body mechanisms, such as vasoconstriction and valves of the veins, assist in pumping blood upwards. [5]

  6. Peripheral vascular system - Wikipedia

    en.wikipedia.org/wiki/Peripheral_vascular_system

    The peripheral vascular system is the part of the circulatory system that consists of the veins and arteries not in the chest or abdomen (i.e. in the arms, hands, legs and feet). [1] [2] The peripheral arteries supply oxygenated blood to the body, and the peripheral veins lead deoxygenated blood from the capillaries in the extremities back to ...

  7. Bloodletting - Wikipedia

    en.wikipedia.org/wiki/Bloodletting

    The popularity of bloodletting in the classical Mediterranean world was reinforced by the ideas of Galen, after he discovered that not only veins but also arteries were filled with blood, not air as was commonly believed at the time. [19] [20] There were two key concepts in his system of bloodletting.

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  9. List of veins of the human body - Wikipedia

    en.wikipedia.org/wiki/List_of_veins_of_the_human...

    A list of veins in the human body: Veins of the heart. Coronary sinus. Great cardiac vein; Oblique vein of left atrium; Middle cardiac vein; Small cardiac vein