But your EKG shows a slightly decreased heart rate.

但你的心电图显示你的心率略有下降.

It shortens as the heart rate increases and lengthens as the heart rate decreases.

它随着心率的增加而缩短，随着心率的降低而延长。

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。

In that situation, the brain still decreases heart rate and blood pressure, but the changes aren't countered with the effects of nicotine, and so you might feel awful.

在这种情况下，大脑仍会降低心率和血压，但这次却没有尼古丁的效应来抵消这些作用，于是你会感到极度不适。

This information is relayed to the cardio regulatory center of the medulla, which responds to the high blood pressure by causing decreased heart rate and causing vasodilation.

这些信息被传递到延髓的心脏调节中心，它通过降低心率和引起血管舒张来对高血压做出反应。