ERYTHROCYTOSIS CAUSED BY HIGH ALTITUDES

ERYTHROCYTOSIS CAUSED BY HIGH ALTITUDES

People who live permanently at high altitudes where the air contains less oxygen than it does at sea level are acclimatised by having high erythrocyte numbers all their lives and may have haematocrits as high as 65%.
Young Tibetan nomad at 13 000 ft collecting yak dung to dry for fuel.