Hypoxia in hospital patients has various causes , from circulation problems to metabolism difficulties .

导致医院患者组织缺氧的原因有很多，从循环问题到代谢障碍等等。

Erythropoiesis is regulated by erythropoietin , which increases in the presence of hypoxia and regulates rbc production .

红细胞受促红细胞生成素调节，促红细胞生成素在缺氧情况下增加，并调节红细胞的生成。

When oxygen levels dip , hif-1 switches on the genes needed to cope with hypoxia .

氧气含量下降，hif-1便开启需要处理低氧的基因。

The cell death , largely due to hypoxia induces angiogenesis which restores a supply of nutrients and facilitates further tumour growth .

细胞的死亡大部分是由于缺氧，从而触发了血管新生，而血管新生可以提供大量的营养储备，供给肿瘤的进一步生长。

The oxygen sensing process enables animals to survive better at low oxygen levels , or ' hypoxia ' .

这种氧感受机制使动物能在低氧或‘缺氧’条件下更好地生存。