Human bodies work best at sea level.
that blood samples taken from four mountaineers in the death zone revealed that the climbers were surviving on just one-quarter of the oxygen they needed at sea level.Five miles above sea level, the air has so little oxygen that even with supplementary air tanks, it can feel like"running on a treadmill and breathing through a straw,"A lack of oxygen results in myriad health risks.
But too much hemoglobin can thicken your blood, making it harder for the heart to pump blood around the body. That can lead to a stroke or the accumulation of fluid in your lungs. Acclimatization to death-zone altitudes simply isn't possible, high-altitude expert and doctor Peter HackettOne of the biggest risk factors at 26,000 feet is hypoxia, a lack of adequate oxygen circulation to organs like your brain. If the brain doesn't get enough oxygen, it can start to swell, causing a condition called high altitude cerebral edema . Essentially, it's HAPE for the brain.
Temperatures in the death zone never rise above zero degrees Fahrenheit."Any exposed skin freezes instantly," Burke said.
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