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And one of them, I woudn't really call it tissue,
第一个，不能说是组织
but you can definitely call it cell type.
确切说是一种细胞类型
It's the RBC, and RBC just stands for red blood cell.
红细胞，或者说RBC(Red Blood Cell)
So people sometimes wonder, you know,
有时候大家会问
if the red blood cells are carrying blood to other parts of the body.
既然红细胞给身体各处输送氧气
Then how do they themselves get oxygen?
红细胞自身怎么得到氧气呢？
Do they just kind of use up some of the oxygen they're carrying, or what exactly?
是直接用掉自身携带的一部分氧气吗？还是会怎样呢？
And to answer this question,I would have to remind you that
要回答这个问题
the red blood cell basically looks a little bit like this, right? In cross section.
大家可以回想一下红细胞的形状。横截面是这样的
And it doesn't have any mitochondria, no mitochondria.
红细胞内是没有线粒体的
So, has no mitochondria.
没有线粒体
And remember,
大家想
mitochondria are these tiny little organelles inside of cells that are using oxygen.
在细胞中用掉氧气的细胞器就是线粒体
So that has no mitochondria, and it's not really using oxygen.
那么没有线粒体的红细胞，就不会消耗氧气
So it's not using oxygen and really these cells,
所以红细胞并不消耗氧气
we call them cells and there are many senses of the word,
细胞这个单词可以有很多的含义
but they don't really have mitochondria, they also don't have nucleus.
但实际上红细胞并没有线粒体也没有细胞核
These are literally amazingly designed cells
可以说，红细胞这样的构造
that are made for the purpose of carrying around oxygen to the body,
就是专为身体各处输送氧气的
because they literally are bags of hemoglobin.
它几乎就是由血红蛋白组成的
So just remember,
所以大家记住
red blood cell don't really need oxygen they're simply carrying it around.
红细胞并不需要氧气，只是输送氧气
Another tissue or organ that makes people kind of wonder,is the heart.
还会引起注意的，是心脏
The heart is pumping all the blood around,
心脏通过挤压，向身体输送血液
but does it actually get oxygen from vessels
但心脏本身
that are in the pulmonary circulation or from the systemic circulation or what?
是从肺循环中获取氧气还是从体循环获取氧气呢？
And here the short answer is systemic circulation.
答案是体循环
