Both vena cavas [sic] are veins, which bring blood towards the heart.

、下脉均为脉，运送血液回流到脏。

Even partial compression of the superior vena cava can cause the venous pressure behind the obstruction to increase.

局部压迫脉甚至能造成阻断后方的脉压升高。

Also, a filter can be surgically placed in the inferior vena cava to prevent pulmonary embolisms.

也可以放置下脉滤器来防止肺栓塞的发生。

But in some situations, an obstruction may prevent blood flow from the portal vein towards the inferior vena cava.

但有时从门脉流到下脉的血流会受阻。

Got it. Wait, I-I think I can localize the bleeding. I think it's coming from the inferior vena cava.

搞定。等等，想可以把血止住了。想它是从下脉出来的。

CT scan or MRI help diagnose ascites, cirrhosis, splenomegally or vascular alterations like inferior vena cava dilatation.

CT扫描或MRI有助于诊断腹水、肝硬化、脾肿大，或血管病变（如下脉扩张）。

On the right side, the superior vena cava, ascending aorta, right ventricle, left ventricle, and inferior vena cava should all be visible.

在脏右侧，分别是脉、升主动脉、右、和下脉。

This happens when there's an obstruction in the passage of blood from the portal vein towards the vena cava.

当血液从门脉流向脉的通道阻塞时，就会发生这种情况。

Ultimately, all of the blood ends up in the superior or inferior vena cava and dumps into the right atrium.

最终，所有的血液都回流至脉和下脉，最终抵达右房。

The superior vena cava is found in the upper chest.

脉位于胸部。

Lastly, G is for great vessels which includes the superior vena cava, inferior vena cava, ascending aorta, aortic arch, pulmonary artery, and descending aorta.

最后，G指大血管" Great vessels" ，包括了脉、下脉、升主动脉、主动脉弓、肺动脉与降主动脉。

The superior vena cava resembles a drain that leads down into the heart.

脉像通向脏的引流管。

Blood from the upper body returns via the superior vena cava, blood from the lower body returns via the inferior vena cava.

半身血液通过脉回流，下半身血液通过下脉回流。

Once the liver processes all these substances, it sends the blood to the heart through the inferior vena cava to enter the systemic venous system.

一旦肝脏处理了所有这些物质，肝脏将血液通过下脉进入体脉系统送往脏。

So, if you think about it, the blood that drains into the inferior vena cava has to move upward, against gravity.

所以，如果你仔细想想，流入下脉的血液必须向流动，对抗重力。

So far, we've learned that blood returning to the heart from head to toe drains into the superior and inferior vena cava.

到目前为止，们已经了解到，血液从头到脚流回脏，流入下脉。

A Pancoast tumor in the right lung apex can also compress a large vein called the superior vena cava which drains blood from the head, upper chest, and arms.

右侧的肺沟瘤还会压迫脉；脉汇集头部、胸部和肢的血液。

The job of the superior vena cava is simple, and like many other major veins in the body, it is nothing more than a transportation tube.

脉的作用很简单，和体内其他许多主要脉一样，它不过是一个运输管。

The venae cavae has two divisions: the superior vena cava and the inferior vena cava, and these divisions both return blood to the right atrium of the heart.

脉和下脉，这些分支都将血液回流到脏的右房。

This is a good way to think about the superior vena cava, because its job is to drain (or return) deoxygenated blood straight down into the right atrium.

这是考虑脉的好方法，因为它的工作是将脱氧的血液直接排入（或回流）到右房中。