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And one of them, I woudn't really call it tissue,
第一個(gè)，不能說(shuō)是組織
but you can definitely call it cell type.
確切說(shuō)是一種細(xì)胞類型
It's the RBC, and RBC just stands for red blood cell.
紅細(xì)胞，或者說(shuō)RBC(Red Blood Cell)
So people sometimes wonder, you know,
有時(shí)候大家會(huì)問(wèn)
if the red blood cells are carrying blood to other parts of the body.
既然紅細(xì)胞給身體各處輸送氧氣
Then how do they themselves get oxygen?
紅細(xì)胞自身怎么得到氧氣呢？
Do they just kind of use up some of the oxygen they're carrying, or what exactly?
是直接用掉自身攜帶的一部分氧氣嗎？還是會(huì)怎樣呢？
And to answer this question,I would have to remind you that
要回答這個(gè)問(wèn)題
the red blood cell basically looks a little bit like this, right? In cross section.
大家可以回想一下紅細(xì)胞的形狀。橫截面是這樣的
And it doesn't have any mitochondria, no mitochondria.
紅細(xì)胞內(nèi)是沒(méi)有線粒體的
So, has no mitochondria.
沒(méi)有線粒體
And remember,
大家想
mitochondria are these tiny little organelles inside of cells that are using oxygen.
在細(xì)胞中用掉氧氣的細(xì)胞器就是線粒體
So that has no mitochondria, and it's not really using oxygen.
那么沒(méi)有線粒體的紅細(xì)胞，就不會(huì)消耗氧氣
So it's not using oxygen and really these cells,
所以紅細(xì)胞并不消耗氧氣
we call them cells and there are many senses of the word,
細(xì)胞這個(gè)單詞可以有很多的含義
but they don't really have mitochondria, they also don't have nucleus.
但實(shí)際上紅細(xì)胞并沒(méi)有線粒體也沒(méi)有細(xì)胞核
These are literally amazingly designed cells
可以說(shuō)，紅細(xì)胞這樣的構(gòu)造
that are made for the purpose of carrying around oxygen to the body,
就是專為身體各處輸送氧氣的
because they literally are bags of hemoglobin.
它幾乎就是由血紅蛋白組成的
So just remember,
所以大家記住
red blood cell don't really need oxygen they're simply carrying it around.
紅細(xì)胞并不需要氧氣，只是輸送氧氣
Another tissue or organ that makes people kind of wonder,is the heart.
還會(huì)引起注意的，是心臟
The heart is pumping all the blood around,
心臟通過(guò)擠壓，向身體輸送血液
but does it actually get oxygen from vessels
但心臟本身
that are in the pulmonary circulation or from the systemic circulation or what?
是從肺循環(huán)中獲取氧氣還是從體循環(huán)獲取氧氣呢？
And here the short answer is systemic circulation.
答案是體循環(huán)
