Isometrics are exercises employing static muscle contractions.

静力训练是一种使用静态肌肉运动。

Muscle contraction can be split into three main types.

肌肉可以被分为三种主要类型。

They directly and efficiently convert electrical energy into muscle contractions.

它们可以直接高效地把电能转化成肌肉。

Muscle contraction, transporting molecules throughout the body, synthesizing DNA, etc.

肌肉，在全身运输分子，合成脱氧核糖核酸等。

These living muscles efficiently convert chemical energy that comes from nutrients into muscle contractions.

这些活肌把来自营养素化学能量高效地转化为肌肉。

It works by blocking the release of a neurotransmitter called acetylcholine, which controls muscle contractions.

乙酰碱释放。乙酰碱正是神经控制肌肉那道指令。

The patient has to be able to produce two independent signals or, or muscle contractions.

病人必须能够产生两个独立信号或肌肉。

It regulates nerve impulses, muscle contractions and maintains the body's balance of water and minerals.

盐可以调节神经脉冲传递、肌肉，并维持体内水分和矿物质平衡。

To better understand myasthenia gravis, let's review normal muscle contraction but at the cellular level.

为了更好理解重症肌无力，我们水平来了解一下肌肉正常时状态。

Muscle contraction expands the chromatophores and helps them change the skin color to match its surroundings.

通过肌肉扩散色素，章鱼以此改变自身肤色融入周围环境。

Hyperkalemia, though, also affects cardiac muscle contractions, which can lead to cardiac arrhythmias and cardiac arrest.

高钾血症，也可以影响心肌，进而导致心律失常和心脏停搏。

During an asthma attack, calcium flows into the cells of the airway and contributes to muscle contraction.

原来哮喘发作时，钙流进气道，于是导致肌肉。

When this happens — and it will, eventually — it's called the sliding filament model of muscle contraction.

当这种情况发生时——最终会发生——我们称之为肌肉滑动纤维模型。

You may twitch, but this doesn't mean there is life in you, these are just muscle contractions.

你可能会抽搐，但这并不意味着那里 是你生命，这些只是肌肉。

Finally, hypokalemia can affect cardiac muscle contractions, which can lead to cardiac arrhythmias and cardiac arrest.

最后，低钾血症会影响心肌，导致心律失常和心搏骤停。

But the threat here is a neurotoxin that affects the nerves in the spinal cord that control muscle contraction.

但马钱子碱是种神经毒素，作用在脑与脊髓神经。同样也是控制肌肉。

Now that we know how muscle contractions happen, let's look at our two main flavors: isotonic and isometric.

现在我们知道了肌肉是如何发生，让我们看看我们两种主要口味：等张和等长。

Low potassium levels leads to issues with muscle contractions, which could be smooth, skeletal, or cardiac muscles.

两种途径低钾水平都会导致肌肉问题，可累及平滑肌、骨骼肌或心肌。

Binding of acetylcholine to its receptor activates a chain reaction in the muscle cell that ultimately results in muscle contraction.

ACh与其受体结合激活了肌肉连锁反应，最终导致肌肉。

Groans is for constipation and muscle weakness, both of which are partly due to decreased muscle contractions.

呻吟指是便秘和肌肉无力，而这两种情况部分原因是肌肉减弱。