时差N小时 你对静脉了解多少(上)（在线收听）

Veins are pretty important.

血管相当的重要。

After all, they carry blood from various parts of the body to the heart.

毕竟，它们从身体的各个部分向心脏运输血液。

But for all their significance, veins are modest, too.

虽然很重要，但血管也很谦逊。

They are usually content to work behind the scenes, tucked away beneath the skin.

血管甘愿在幕后工作，在皮肤下默默运输血液。

Sometimes, however, veins take center-stage and become visible as blue lines on the skin, often resembling an unmarked roadmap.

然而，有时候血管成为主角，在皮肤上可以看到蓝色的线，很像未被标记的地图。

If you haven't guessed by now, we're talking about varicose veins.

如果你还没有猜到，我们讨论的正是静脉曲张的血管。

Have you ever wondered what are they are and how they form?

你是否想知道它们是什么并怎样形成的？

Basically, a varicose vein is one that is twisted and filled with backed-up blood.

通常，静脉曲张的血管充满回流的血液并因此扭曲。

Although they most commonly occur in the legs, varicose veins can also happen in the esophagus, testes and the urinary bladder.

它们不仅多见于腿部，也会表现在食管、睾丸、膀胱上。