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本集视频介绍了心脏、肺及红细胞如何获取氧气的情况，帮助观者扫清疑惑，明确血液流动路线和两大循环系统，巩固基础知识。
n. 核，核心，细胞核，原子核
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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
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| 重点单词 | 查看全部解释 | |||
| nucleus | ['nju:kliəs] | |||
| cell | [sel] | |||
| circulation | [.sə:kju'leiʃən] | 联想记忆 | ||
| tissue | ['tiʃu:] |
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