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The blood vessels in human body carry blood. Arteries, capillaries and veins.  Veins carry blood back to the heart from capillaries of the body.

The total length of all these vessels together could be around 90, 000 km.  The number of veins is not easily countable. Perhaps it is in millions.  This number could also vary from person to person.

One may be able to  count large and main veins.

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Number of veins is not easily countable because it varies in  person.
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