External Gas transport Tissue respiration +Hb circulation cells 低张性缺氧 血液性缺氧 循环性缺氧 组织性缺氧 Hypotonic Hemic Circulatory Histogenous hypoxia hypoxia hypoxia hypoxia Air Gas transport +Hb circulation Tissue cells External respiration 血液性缺氧 Hemic hypoxia 循环性缺氧 Circulatory hypoxia 低张性缺氧 Hypotonic hypoxia 组织性缺氧 Histogenous hypoxia