Editing Acclimatization (section)

====Humans====
{{See also|Cold and heat adaptations in humans}}

The [[salt]] content of sweat and urine decreases as people acclimatize to hot conditions.<ref name="armyheat">{{cite web|url=http://www.usariem.army.mil/pages/download/heatacclimatizationguide.pdf|archive-url=https://web.archive.org/web/20070702085236/http://www.usariem.army.mil/download/heatacclimatizationguide.pdf|archive-date=2007-07-02|title=Heat acclimatization guide|publisher=US Army|access-date=2009-07-02}}</ref> Plasma volume, heart rate, and capillary activation are also affected.<ref>{{Cite web|url=http://www.sportsci.org/encyc/heataccl/heataccl.html|title=Heat Acclimatization|website=www.sportsci.org|access-date=2017-12-03}}</ref>

[[Effects of high altitude on humans|Acclimatization to high altitude]] continues for months or even years after initial ascent, and ultimately enables humans to survive in an environment that, without acclimatization, would kill them. Humans who migrate permanently to a higher altitude naturally acclimatize to their new environment by developing an increase in the number of [[red blood cells]] to increase the [[oxygen]] carrying capacity of the [[blood]], in order to compensate for lower levels of [[oxygen]] intake.<ref name=Acclimatisation>{{cite journal |author1=Muza, SR |author2=Fulco, CS |author3=Cymerman, A |title=Altitude Acclimatization Guide. |journal=US Army Research Inst. Of Environmental Medicine Thermal and Mountain Medicine Division Technical Report |issue=USARIEM–TN–04–05 |year=2004 |url=http://archive.rubicon-foundation.org/7616 |access-date=2009-03-05 |archive-url=https://web.archive.org/web/20090423042451/http://archive.rubicon-foundation.org/7616 |archive-date=2009-04-23 |url-status=usurped }}</ref><ref name="Kenneth">{{cite web | author1=Kenneth Baillie | author2=Alistair Simpson | title=Altitude oxygen calculator | url=http://www.altitude.org/oxygen_levels.php | publisher=Apex (Altitude Physiology EXpeditions) | access-date=2006-08-10 | archive-url=https://web.archive.org/web/20170611073650/http://www.altitude.org/oxygen_levels.php | archive-date=2017-06-11 | url-status=dead }} - Altitude physiology model</ref>