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心脏位于胸腔的正中央，从胚胎的第四周开始为人体输送血液，直到死亡为止，从不停止，这个过程大约为人体循环输送1.75亿升血液。本系列课程介绍了人体整个循环系统的组成与各部分的功能，主要内容包括：心脏，血管，血压，淋巴，胎儿与成人的循环过程，血压控制，心肌收缩，心脏的神经调节等内容。
n. 静脉，纹理，叶脉，岩脉
vt. 使有脉络
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- So the final thing you'll notice,
- 最后大家会注意
- if you look at this picture it's hard not to notice, is that there are these,
- 看图可能不是太清晰，大家看这里
- kind of wriggly looking little blood vessels all over the heart.
- 心脏壁有一些弯曲的小血管
- And what are these exactly?
- 这些是什么呢？
- I mean, you've got red ones, and blue ones,
- 既有红色的，也有蓝色的
- and the blue ones are the veins, and the red ones are the arteries
- 蓝色的是静脉，红色的是动脉
- but are they part of the systemic flow, or pulmonary flow, or something else?
- 它们属于体循环，还是肺循环，还是都不属于呢？
- Well, these vessels, all of them, together are called coronary vessels.
- 这些血管，统称为冠状血管
- And so specifically you might hear about a coronary artery, or a coronary vein,
- 大家可能听说过冠状动脉或者冠状静脉
- but together you can call them coronary blood vessels.
- 这些统称为冠状血管
- I'll add the word blood here.
- 这就是冠状血管
- So these coronary blood vessels are actually serving the heart muscle itself.
- 而这些冠状血管实际上是为心脏肌肉服务的
- I mean remember, the heart is made up of thousands and thousands,
- 大家不要忘了心脏本身
- actually tens of thousands of cells and those cells,
- 也是有无数细胞构成的
- just like our toe cell that we drew out in the corner,
- 就像刚画的脚趾细胞
- they also need oxygen, nutrients, and have waste.
- 心脏细胞也需要氧气和养料，也会产生废物
- So,those cells are going to need blood vessels supplying them as well.
- 所以心脏细胞也需要自己的血管
- So, that's what the coronary blood vessels are.
- 这就是冠状血管的功能
- They're literally the blood vessels that go to and serve the heart.
- 它们是为心脏细胞服务的血管
- So these are the ones that serve the heart.
- 这都是为心脏服务的血管
- Now, if they're serving the heart muscles and the heart cells,
- 所以，如果它们是为心脏肌肉和细胞服务的
- then, think about it, would they fit under the systemic flow, or pulmonary flow?
- 大家想一下这属于体循环，还是肺循环？
- Well if the main job is to serve the needs of cells,
- 既然是为了维持细胞生存
- then the coronary vessels fall under the systmic flow.
- 冠状血管就是属于体循环
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