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

上、下均为，运送血液回流到心脏。

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

也可以放置下滤器来防止肺栓塞的发。

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

局部压迫上甚至能造成阻断后方的压升高。

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

但有时从门流到下的血流会受阻。

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

定。等等，我想我可以把血止住了。我想它是从下出来的。

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.

在心脏右侧，分别是上、升主动、右心室、左心室和下。

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

当血液从门流向的通道阻塞时，就会发这种情况。

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上和下，最终抵达右心房。

The superior vena cava is found in the upper chest.

上位于上胸部。

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" ，包括了上、下、升主动、主动弓、肺动降主动。

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

上半身血液通过上回流，下半身血液通过下回流。

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

上像通向心脏的引流管。

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，肝脏将血液通过下进入体系统送往心脏。

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，流入下的血液必须向上流动，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，我们已经了解到，血液从头到脚流回心脏，流入上下。

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.

右侧的肺上沟瘤还会压迫上；上汇集头部、上胸部和上肢的血液。

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.

上的作用很简单，和体内其他许多主要一样，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.

上和下，这些分支都将血液回流到心脏的右心房。

Now, the lower half of the body drains into the inferior vena cava and the upper half drains into the superior vena cava both of which dump blood back into the right atrium.

然后，下半身的血液流入下，上半身的血液则流入上，由这两者将血液送回右心房。