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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. 流通，循环，发行量，消息传播
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- And you might say, well that wasn't so difficult.
- 大家可能要说，这不难
- I'll say bronchial vessels, because there are also some veins coming off.
- 我们还是说支气管血管，因为也有静脉
- Actually let me draw the veins now for you,
- 我画一下静脉的部分
- so you can see how those kind of end up
- 这样大家就看到
- and these veins come from -of course- the right lung and they actually end up -kind of- dumping in here.
- 静脉从右肺来到这里
- I can't really show blue on blue,
- 蓝色在蓝色上画，不明显
- but you know, just try to see they kind of go there.
- 大家知道来到这里就可以了
- And you've got another vein from the other lung kind of following a parallel path and going into the veins as well.
- 同时还有另一条静脉，从另一边的肺差不多平行来到这里
- And so they don't dump necessarily directly into the inferior/ superior vena cava.
- 所以并不是直接进入上下腔动脉
- I just want to show that they go into the venous side on the systemic circulation.
- 大家只要知道这是进入了体循环的静脉部分
- So if that was it, that would be really simple.
- 如果只是这样，情况就简单了
- But, actually lungs are kind of interesting in the sense that there is a lot of mixing going on.
- 但实际上肺内是有一些混合的过程的
- You've got pulmonary arteries carrying blood,
- 肺动脉携带氧气
- you've got bronchial arteries carrying blood and that blood mixes.
- 支气管动脉也携带氧气，两种血液混合
- And then you've got the capillaries,
- 同时还有肺部毛细血管
- you've got some blood kind of from both places
- 这样血液的来源
- the pulmonary circulation and the blood from the systemic circulation again mixing.
- 既有肺循环，也有体循环
- And then on the other side where the veins are bringing blood back to the heart
- 而在另一边把血液送回心脏的静脉
- most of the blood as it turns out, most of the blood actually goes this way into the pulmonary veins.
- 这些血液，大多数血液都进入了肺部静脉
- So even though you have the bronchial arteries bringing blood in, that would be right here,
- 所以就算支气管动脉输入了一部分血液在这里
- you know the bronchial arteries bringing blood in,
- 支气管动脉输入了血液
- a lot of that blood ends up going into that pulmonary circulation.
- 很多血液都进入了肺循环
- So that's kind of an intersting fact that not as much goes this way directly into that systemic circulation
- 所以并没有多少血液进入体循环
- So that's kind of the tricky thing to keep in mind
- 这个知识点比较有意思
- but the lungs then technically really are getting blood both from the systemic circulation
- 实际上肺既有来自体循环的血液
- but also they are kind of mixing blood and they're mixing blood with the pulmonary circulation.
- 同时又跟肺循环的血液混合在一起
- We'll talk a little bit more about this in another video and I don't want you to feel like this kind of got too confusing
- 之后我们再详细介绍这一点，希望大家看完不要混淆
- but I just want you to be aware that there is mixing going on in the lungs with the systemic and pulmonary circulation.
- 要记住，肺中的血液发生了体循环和肺循环的混合
- It's kind of a unique organ in that sense.
- 这么想的话，肺是比较独特的一个器官了
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