It's unclear whether the same sympathetic nerves make us gray as we age.

目前尚不清楚交感神经是否也会让我们的头发随年龄变白。

Normally, these sympathetic nerves help to dilate the pupil, raise the eyelid, and help stimulate the sweat glands.

正常情况下，这些交感神经能扩瞳、提上眼睑，以及协助刺激汗腺。

Now, at the first thoracic nerve root or T1, you've got sympathetic nerves that supply the head, neck and eyes.

同时，交感神经纤维，从第一胸髓神经根或T1发出，支配你的头、颈和双眼。

Going back to that turkey, when you're running, the sympathetic nerves stimulate those beta 2 adrenergic receptors and increase the diameter of the airways.

再来看逃离大鹅的例子：当我们在奔跑时，交感神经系统激动β2受体，使气道扩张，以吸入更多氧气。

While the sympathetic nerves all spring from the thoracolumbar area of your spinal cord, right around your midsection, the nerves of the parasympathetic division are craniosacral.

交感神经都是从你的脊髓胸腰区放射，就在你的腹部附近，副交感神经区域则是位于颅骶。

And because the roots of these nerve fibers basically frame the starting points of the sympathetic nerves, they were called parasympathetic — literally " beside the sympathetic."

因为这些神经纤维的根基本上构成了交感神经的起点，它们被称为副交感神经——字面意思是在交感神经旁边。

Sensors inside the washing machine will measure the state of sympathetic and parasympathetic nerves, and the built-in AI will use the collected data to create the most comfortable atmosphere possible.

洗澡机内的传感器将会感知用户的交感神经和副交感神经状态，内置智能系统会利用收集的数据来营造尽可能舒适的氛围。

Therefore, to raise blood pressure, the body will first cause an increase in sympathetic nerve activity to the SA node, causing it to fire more frequently, which increases the heart rate.

因此，要升高血压，身体首先会引起SA结交感神经活动增加，使其更频繁地放电，从而增加心率。

If a pancoast tumor pushes on or invades these sympathetic nerves, it can cause miosis - a small or constricted pupil, ptosis - a droopy eyelid, and anhydrosis - a failure to sweat, all on the ipsilateral, or same side, of the face as the nerve.

如果肺上沟瘤向上挤压或侵袭交感神经，则会出现瞳孔缩小、上睑下垂、无汗等症状，这些都发生于神经支配的同侧面部。