hematopoiesis. (physiology). The process by which the cellular elements of the blood are formed.ematopoiesis. (physiology). The process by which the cellular elements of the blood are formed.
This is why Everest climbers typically make several trips up and down the mountain to increasingly high elevation camps to acclimate their bodies to high altitude conditions. Other risks to Everest climbers include frostbite and hypothermia from the extreme temperatures, thrombosis or embolisms caused by thickening of blood in response to high altitude, extreme sunburn, and broken bones from falls.
1 Avalanches are the major cause of death for climbers.  As you ascend up Everest, you naturally lose access to oxygen. By the time you reached one-third (10,000 feet)up the mountain, you have lost 33% of the oxygen. By the time you reached two-thirds (20,000 feet) up the mountain, you have lost 50%.