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If the valves in veins of the legs fail ...

If the valves in veins of the legs fail to stop the flow of blood, what could be the consequences of this failure?

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1) If the valves in veins of the legs fail to stop flow of blood, the blood accumulates in the veins and causes swelling or inflammation and more clotting.
2) Clotting can block or slow blood flow through the veins raising the blood pressure and possibly causing more damage.
3) The swelling of the veins also results in varicose veins and spider veins.
4) If varicose veins are untreated for long time, it leads to venous ulceration.
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Knowledge Check

  • The vein of healthy person is horizontal and its length is 0.04m and has internal radius Imm. At 37^(@)C , the average velocity of blood through the vein is 4cm s^(-1) Find. (i) the rate of flow of the blood (ii) the velocity at the mid point of the verin and (iii) the decreases in pressure at th other end of the vein. Take eta_("blood")=4xx10^(-3)Pa-sec

    A
    `1.25xx10^(-7), m^(3)s^(-1), 0.08 m s^(-1), 50.9 Pa`
    B
    `0.08xx10^(-7)m^(3), s^(-1), 0.8 ms^(-1), 50.9 Pa`
    C
    `1.25xx10^(-7)m^(3),s^(-1),0.08 ms^(-1), 5.09 Pa`
    D
    `1.25xx10^(-7), m^(3), s^(-1), 50.9Pa`

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