Second, when oxygen is being delivered by a cell-free carrier instead of red blood cells, complex biological mechanisms alter the flow through the smallest blood vessels ( the arterioles and capillaries).

• 其次，当氧气被替代血红细胞的游离细胞载体传送时，复杂的生物反应机理改变了通过最小血管(微动脉和毛细血管)的流动。