来自《耶鲁大学开放课程：生物医学工程探索 第5集 第5集》
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They make up about 45% to 50%红细胞占血液体积的 -
of the volume of blood is red cells.45%到50% -
They're red because they contain红细胞的红色源于 -
a special protein called hemoglobin其内部一种叫做血红蛋白的特殊蛋白质 -
which is very concentrated inside the cell.血红蛋白在细胞内的浓度很高 -
Hemoglobin, as you know, is an oxygen carrier众所周知 血红蛋白可以携带氧气 -
and so red blood cells concentrate in bags of hemoglobin含有大量血红蛋白的红细胞 -
which circulate in your blood and they carry oxygen.在全身循环 以携带氧气 -
Well, it was not very我可以很容易的画出 -
hard for me to draw this red blood cell here,一个血红细胞 -
it's just an oval, and one reason I draw it like an oval,就画个椭圆足矣 -
is that that's basically what it looks like if you look at it.因为它看上去就是这个样子的