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假如献了血,血液需要多长时间才能恢复到献血前水平呢?这是广大献血者所关心的问题。我们知道,血液是由血浆和血细胞组成的。血浆约占血液总容积的55%,其主要成分是水(约占92%),其余的是固体物质(约占8%),包括血浆蛋白、无机盐等。血细胞约占血液总容积的45%,包括红细胞、白细胞和血小板。这些血细胞都有一定的寿命,如红细胞的寿命是80~120天,白细胞的寿命是7~14天,血小板的寿命是7~9天。正常情况下,每天约有40毫升红细胞死亡,同时,也有相应的红
If blood donation, blood how long it takes to return to pre-blood donation level? This is the majority of blood donors are concerned about. We know that blood is composed of plasma and blood cells. About 55% of the total volume of blood plasma, the main component is water (about 92%), the rest of the solid material (about 8%), including plasma proteins, inorganic salts and so on. Blood cells account for about 45% of the total volume of blood, including red blood cells, white blood cells and platelets. These blood cells have a certain life expectancy, such as the life span of red blood cells is 80 to 120 days, the life span of white blood cells is 7 to 14 days, and the life span of platelets is 7 to 9 days. Under normal circumstances, about 40 ml of red blood cells die each day, at the same time, there is also a corresponding red