<font face="Verdana, Arial, Helvetica" size="2">Just as matter if interest hiw do these people live high in the Andes or climb Eversest with out O2</font>
These folk become polycythaemic - a posh way of saying they have more haemoglobin than dwellers at sea level. This enables them to carry more oxygen/ml of blood. It takes several weeks or even months to produce the extra red cells to house all this Haemoglobin. Everest climbers go and live on the tops of mountains before they try the climb.
A greater concentration of red cells also increases the risk of DVT but that's another thread altogether....
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edited for the customary appalling typing
[This message has been edited by Code Blue (edited 28 January 2001).]