Search results
Results From The WOW.Com Content Network
However, the human body has both short-term and long-term adaptations to altitude that allow it to partially compensate for the lack of oxygen. There is a limit to the level of adaptation; mountaineers refer to the altitudes above 8,000 metres (26,000 ft) as the death zone, where it is generally believed that no human body can acclimatize.
The human body has optimal endurance below 150 m (490 ft) elevation. [6] The concentration of oxygen (O 2) in air is 20.9% so the partial pressure of O 2 (PO 2) at sea level is about 21.2 kPa (6.3 inHg; 3.07 psi). In healthy individuals, this saturates hemoglobin, the oxygen-binding red pigment in red blood cells. [7]
Limit of the whole year populated areas, limit of a growing season of 100 days. Altimontane zone , 1,300 – 1,850 m (Eastern Alps), 800 – 1,500 m (Central Uplands). Deciduous forests limit, Sycamore Maple ( Acer pseudoplatanus ) and European Beech ( Fagus sylvatica ).
Humans are generally adapted to lowland environments where oxygen is abundant. [12] At altitudes above 2,500 meters (8,200 ft), such humans experience altitude sickness, which is a type of hypoxia, a clinical syndrome of severe lack of oxygen. Some humans develop the illness beginning at above 1,500 meters (5,000 ft). [13]
Human populations have developed agricultural production strategies to exploit varying characteristics of altitudinal zones. Elevation, climate, and soil fertility set upper limits on types of crops that can reside in each zone.
The Armstrong limit or Armstrong's line is a measure of altitude above which atmospheric pressure is sufficiently low that water boils at the normal temperature of the human body. Exposure to pressure below this limit results in a rapid loss of consciousness, followed by a series of changes to cardiovascular and neurological functions, and ...
Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!
Land surface elevation extremes by country; Country or region Highest point Maximum elevation Lowest point Minimum elevation Elevation span Afghanistan: Noshaq: 7492 m 24,580 ft Amu Darya: 258 m 846 ft 7234 m 23,734 ft Albania: Korab: 2764 m 9,068 ft Adriatic Sea: sea level 2764 m 9,068 ft Algeria: Mount Tahat: 3003 m 9,852 ft Chott Melrhir ...