EntityQ6171655· pop 21· linked from 354 articlesdeath zoneSign in to savealtitudes above which the pressure of oxygen is insufficient to sustain human life for an extended time spanConnectionsglossary of climbing termsEntityradiation burnEntityrock and sport climbing equipmentEntityrespiratory centerEntityCampus boardEntitybreathingEntityhemoglobinEntityhypoxiaEntitymotion sicknessEntityvia ferrataEntitypeak expiratory flowEntitybuilderingEntityAltitude sicknessEntityradiation-induced neoplasmsEntityalpine climbingEntityAsiaEntityoxygenEntityMount EverestConceptHimalayasEntityEdmund HillaryEntityCategoriesEight-thousandersHuman physiologyMountaineering