And, foils being what they are, the reverse is of course true for the parasympathetic system.

而且，副交感神经系统的情况正好和陪衬是相反的。

If the heat generated is intense enough, the body's parasympathetic nervous system is triggered, which creates a relaxation response.

如果产生的热量足够强烈，身体的副交感神经系统就会被触发，从而产生放松反应。

But the nerve fibers of your parasympathetic system begin both above and below where the sympathetic ones do.

但是副交感神经系统的神经纤维是从交感神经的上方和下方开始的。

So the parasympathetic system is why our hearts don't pump so hard that they explode, sure.

所以副交感神经系统是为什么我们的心脏不会用力跳动到爆炸的原因，这是当然的。

Part of what keeps your heart under control is your parasympathetic nervous system.

保证心脏处于可控状态的部分原因是你的副交感神经系统。

And the other one talks you down and effectively undoes what its foil did. And that is the parasympathetic nervous system.

另一个会让你沮丧，有效地解除它的衬托所起的作用。那是副交感神经系统。

That is where your sympathetic system's more mellow half-brother, the parasympathetic system comes in.

这就是你的交感神经系统更成熟的同父异母兄弟——副交感神经系统的用武之地。

The second half, that's the exhale, comes from your parasympathetic nervous system, which affects your ability to relax and calm down.

后半部分，呼气，副交感神经系统发挥作用，影响放松和平静的能力。

That's why you need your parasympathetic system to keep your heart from racing like a rabbit's.

这就是为什么你需要你的副交感神经系统来防止你的心脏像兔子一样跳动。

By the same token, the resting and digesting that's overseen by the parasympathetic system doesn't require urgent, all-hands-on deck communication.

同样，由副交感神经系统监督的休息和消化不需要紧急的、全员参与的沟通。

Then, the prefrontal cortex takes over from the amygdala and stimulates the parasympathetic nervous system.

然后，前额叶皮层接管杏仁核并刺激副交感神经系统。

Some drugs, like ones for overactive bladders or excessive sweating, target the entire parasympathetic nervous system.

有些药物，例如治疗膀胱过度活动症或过度出汗的药物， 会针对整个副交感神经系统。

We also see that the parasympathetic nervous system decreases heart rate, which decreases cardiac output.

我们还看到副交感神经系统降低了心率，从而降低了心输出量。

We also learned that the parasympathetic nervous system can decrease the heart rate.

我们还了解到，副交感神经系统可以降低心率。

In the opposite way, the parasympathetic nervous system can decrease the heart rate, which decreases the cardiac output.

副交感神经系统以相反的方式，可以降低心率，从而降低心输出量。

Oh, but just one thing? Learning about the parasympathetic system is going to involve a lot of memorizing. Hope that doesn't stress you out.

但有一件事需要注意。学习副交感神经系统需要大量的记忆。希望这不会让你感到压力。

Unlike your sympathetic division, which lets you deal with the crisis of the now, the parasympathetic system allows your body to handle … everything else.

与你负责处理此刻危机的交感神经不同，副交感神经系统让你的身体得以处理… 其他一切事务。

Coupled with the sudden relaxation, courtesy of the parasympathetic system, the body can experience chills because it cools too fast and is not used to the lower core temperature.

再加上副交感神经系统的突然放松，身体会感到发冷，因为它冷却得太快，不习惯较低的核心温度。

Physiological benefits such as our heart variability, which is a predictor of longevity, which is a predictor of health is increased. The parasympathetic system increases when we are grateful.

对身体的好处，包括心率变异性，它能预测我们是否能长寿，预测我们是否健康。当我们感激时，副交感神经系统功能增强。

Mainly that it consists of two primary, complementary divisions, the sympathetic nervous system, which arouses your body, and the parasympathetic nervous system, which is charge of resting, digesting, and repair.

主要由两个主要的互补部门组成，交感神经系统，唤醒你的身体，副交感神经系统，负责休息、消化和修复。