评论
打印
本集视频从两大循环系统的角度对动脉和静脉血管在血液流速、血压、血量等方面进行了介绍，归纳总结了动脉和静脉之间的五个区别，巩固基础知识的掌握。
n. 伸展，张开
adj. 可伸缩的
您现在的位置： 首页 > 英语听力 > 公开课 > 保健与医学:循环系统 > 正文
- Okay let's talk about the arteries and the veins
- 下面我们来看动脉和静脉的内容
- and I'm actually going to talk about both of them
- 我们同时介绍这两部分内容
- and simultaneously because there are some really interesting differences I want to point out between the two.
- 因为这两者之间有一些很有意思的不同点
- We know that they're both vessels
- 我们知道它们都是血管
- but there are some really important differences between how they work and what they do.
- 但两者之间在工作机理和内容上是有很大不同的
- So this is your heart and coming off your heart is the aorta
- 假设这是心脏，延伸出来的是主动脉
- and before this video I have been drawing the aorta quite differently,
- 之前我们介绍过这次画的主动脉跟之前的介绍有所不同
- kind of showing its branches and here I am showing it kind of stretched out.
- 重点展示的是血管的分支，把血管拉伸
- and I'll show a few of the branches
- 这里我标注几条血管分支
- but really the point of the drawing is not to make it anatomically correct,
- 这么画的重点不在于说各位置的精确
- you can tell that definitely it's not anatomically correct,
- 很明显，位置是不太精确的
- because that wouldn't make any sense at all, that blood going off to one side.
- 如果血液都流向一边，很明显是不可能的
- But really, I want to show you a concept in this video.
- 这里我只是给大家介绍概念
- A few concepts, actually.
- 所以用简图代替
- So, here we have --let's say, the vein.
- 假设这是静脉
- And I'm gonna stretch that out as well,
- 也是这样延伸出来
- and let's imagine that all of the veins are dumping into this one final vein.
- 那么大家看，假设所有静脉都汇聚到这一条
- It gets back to the --to the heart.
- 然后流回心脏
- So I'll draw the branches kind of coming in to the vein here and here.
- 静脉的分支，我稍微画几条
- And we know that the arteries and the vein are trying to get blood out to the capillaries.
- 我们知道，动脉和静脉都是与毛细血管进行血液交换
- So these show you what a zoomed in version might look like of the capillaries.
- 这里我们放大来看，这里是毛细血管
- So we've got --let's say, some capillaries, here and maybe some here and here.
- 假设这里有一些毛细血管，在这里
- And you know of course in real life you don't have three sets of capillary beds,
- 当然大家想，实际上不可能只有三组毛细血管床
- which is what I'm drawing here, but really thousands and thousands, right?
- 这里只画了三组，但实际上，应该是成千上万的
- And let's not to forget, you know,
- 大家要记住
- these capillaries are basically found in different parts in the body,
- 这些毛细血管是来自身体各处的
- so you might have --for example, a bone, and some capillaries in the bone,
- 比方说，可能是来自骨头中的毛细血管
- you may have this second capillary, might be going to your face,
- 比方说第二组毛细血管，可能是在脸部
- let's say even specifically, your nose.
- 可能是鼻子上的
- And this third capillary bed, that might be going down to your foot.
- 这第三组，可能是来自足部
- So you have blood in your foot.
- 来自足部血管
- So you have different parts of the body all getting capillaries and the blood is gonna start at the heart,
- 这样，身体各处都有毛细血管，血液从心脏处开始
- go to the capillaries through the arteries, and then return through all of those veins.
- 通过动脉来到毛细血管，然后通过静脉回归心脏
- And we've kind of lumped it together.
- 我们现在是把所有动脉和静脉画在一起了
扫描二维码进行跟读打分训练
- 阅读本文的人还阅读了：
可可英语官方微信(微信号:ikekenet)
每天向大家推送短小精悍的英语学习资料.
添加方式1.扫描上方可可官方微信二维码。
添加方式2.搜索微信号ikekenet添加即可。
添加方式1.扫描上方可可官方微信二维码。
添加方式2.搜索微信号ikekenet添加即可。
