So how does reduced contractility do that?

那么，收缩是低的呢？

When nicotine binds to receptors in the peripheral nervous system, it increases blood pressure, heart rate, cardiac contractility, and gastrointestinal tract activity.

尼古丁在与周围神经系统的受相结合时，会引起血压升高，心率加快，心肌收缩增强，胃肠道蠕动增加等。

If your heart has decreased contractility then it's going to have to work harder to maintain proper profusion of your body with blood.

果心脏收缩下，那么它将不得不更加努地维持当的血液灌注。

However because calcium is also involved in cardiac myocyte contraction, these agents also reduce contractility of the heart and should not be used in case of systolic heart failures.

然而，因为钙通道也参与了心肌收缩，所以这些药物也会减弱心脏的收缩，因此收缩性心衰竭患者不应该使用该类药物。

So, one of the things is they cause our heart to have decreased contractility, because after a heart attack, you've sustained some damage to your heart muscle, so it can't always contract very well.

第一是心脏收缩下，因为心脏病发作后，心肌受到损害，因此收缩能下。