As for fixing human hearts? Perhaps manipulating thyroid hormone levels could be a start.

那人类心脏能修复吗？也许可以从控制甲状腺激素水平始。

So, thyroid hormone for the win, right? What's not to love?

所以，甲状腺激素是最棒的，对吗？还有啥理由不爱它呢。

This results in growth of the thyroid glands and stimulates the follicular cells to produce excess thyroid hormone.

这会导致甲状腺增生并刺激细胞，产生过量的甲状腺激素。

Because when they added extra thyroid hormone to zebrafish's tanks, their tiny hearts were no longer able to regenerate.

因为当他们向斑马鱼鱼缸中加入额外的甲状腺激素时，斑马鱼的小心脏不能再生了。

Another primary cause is toxic nodular goiter where one or more follicles starts generating lots of thyroid hormone.

另一个原发病因是毒性结节性甲状腺肿，即一个或多个始产生大量的甲状腺激素。

Like steroids, thyroid hormone is lipid-soluble, so it crosses the membrane of its target cell to bind inside the nucleus.

像类固醇一样，甲状腺激素是脂溶性的，所以它穿过靶细胞的膜与细胞核结。

Also anytime the thyroid gets inflamed or damaged there can be a large release of preformed thyroid hormones.

甲状腺发炎或受损，也可能大量释放预先形成的甲状腺激素。

If there's too much thyroid hormone, they both decrease their own hormone production, to stop stimulating the thyroid.

如果甲状腺激素过多，它们都会减少自身的激素分泌，停止刺激甲状腺。

If it's due to a primary cause, TSH will be low, an unbound thyroid hormones will be high.

如果是原发性甲亢，TSH水平将会很低，未结的甲状腺激素水平会变高。

Hassen called the lab. He ordered tests to check the level of thyroid hormone in the sample. It was very high.

哈森打电话给实验室，要求化验样本中甲状腺激素的含量。结果显示甲状腺激素含量非常高。

A medication called methimazole, for example, decreases production of thyroid hormones.

例如，一种叫做甲巯咪唑的药物会减少甲状腺激素的产生。

Perhaps manipulating thyroid hormone levels could be a start.

或许操纵甲状腺激素水平可能是一个始。

All of them result in too much thyroid hormone in a hyper metabolic state where cellular reactions are happening faster than normal.

其后果都是产生过多的甲状腺激素，形成高代谢状态，即细胞反应比正常情况发生得更快。

That in turn reduces thyroid hormone levels in the blood, and slows down your metabolism again, before you get over-heated.

这反过来会降低血液中的甲状腺激素水平，并在你过热之前再次减慢你的新陈代谢。

Rarely, in some people - usually young, often male - too much thyroid hormone can make circulating potassium levels drop and cause weakness.

甲状腺激素过量会使循环钾含量下降，继而导致虚弱，这通常出现在轻男性身上，但很罕见。

And hypo- and hyperthyroidism occur when the thyroid gland makes too little or too much thyroid hormone.

当甲状腺产生的甲状腺激素过少或过多时，就会发生甲状腺功能减退症和甲状腺功能亢进症。

Too much thyroid hormone causes the body to race. Too little, and it slows to a crawl. Unchecked, either state can be fatal.

甲状腺激素过多会导致身体处于亢奋状态。而甲状腺激素过少，身体慢慢变得迟钝。如果放任不管，任何一种状态都可能致命。

One example, is a struma ovarii tumor which is made up of only thyroid tissue and can release thyroid hormone which leads to hyperthyroidism.

其中一个例子是卵巢甲状腺肿，只由甲状腺组织组成，并且可以分泌甲状腺素，造成甲亢。

It’s a molecule that interferes with how natural hormones – like estrogen, androgen, and thyroid hormones – work in the body.

它是一种干扰天然荷尔蒙（如雌激素、雄激素和甲状腺激素）在体内发挥作用的分子。

And she was losing weight even though she was eating all the time, because the thyroid hormone was no longer regulating her metabolism properly.

即使她一直在吃东西，她的体重也在下降，因为甲状腺激素不再正常调节她的新陈代谢。