Precisely what makes the motor neurons degenerate is the prevailing mystery of ALS.

使运动神经元退化的原因正是ALS的流行之谜。

GAD helps make gamma-aminobutyric acid (GABA), which regulates motor neurons in the brain.

谷氨酸脱羧酶有助于制造γ-氨基丁酸（GABA），它调节大脑中的运动神经元。

This tightness results from a lesion in an upper motor neuron.

这种僵硬由上运动神经元损伤引起。

If this reflex is absent, it could indicate that you have a lower motor neuron problem.

如果这种反射不存在，它可能表明你的下部运动神经元有问题。

So, contractions intensify as your motor neurons stimulate more and more muscle fibers.

所以，当你的运动神经元刺激越来越多的肌肉纤维时，收缩会加剧。

ALS affects two types of nerve cells called the upper and lower motor neurons.

ALS影响两种类型的神经细胞，称为上下运动神经元。

Defective immune cells may also play a role in killing motor neurons.

有缺陷的免疫细胞也可能在杀死运动神经元中发挥作用。

These are considered lower motor neuron signs.

这些都可以看作下运动神经元征。

One prevailing idea is that certain proteins inside the motor neurons aren't folding correctly, and are instead forming clumps.

一个主流想法是运动神经元内的某些蛋白质没有正确折叠，而是形成团块。

We've also learned that along with motor neurons and muscle fibers, ALS could involve other cell types.

我们还了解到连同运动神经元和肌肉纤维，ALS可能还会涉及其他细胞类型。

Meanwhile, at the level of lesion, the lower motor neuron of the right ventral horn will also be damaged.

同时，在病变水平，右侧脊髓前角的下运动神经元也会受到损伤。

A motor unit is a group of muscle fibers that all get their signals from the same, single motor neuron.

运动单元是一组肌肉纤维，它们都从同一个运动神经元接收信号。

Even then, ALS involves multiple genes with multiple possible impacts on motor neurons, making the precise triggers hard to pinpoint.

即使在那时，ALS也涉及多个基因对运动神经元有多种可能的影响，使得精确触发器难以精确定位。

In other words, there are two upper motor neurons, one from each side of the brain, giving input to one lower motor neuron.

换言之，这里有两种上运动神经元，分别来自大脑两侧，向下运动神经元传导信息。

My brain sends an action potential along the motor neuron until it synapses with a muscle cell in my arm.

我的大脑沿着运动神经元发送动作电位，直到它与我手臂上的肌肉细胞突触。

Your brain process that information and send response through motor neurons, known as efferent neurons, that you must put that cup back.

你的大脑处理这些信息，并通过运动神经元（也称为传出神经元）发送反应，你必须把杯子放回去。

It blocks motor neurons from affecting muscle fibers.

它阻止运动神经元影响肌肉纤维。

In tetanus, Renshaw cells fail to work and the alpha motor neuron keeps firing without any inhibitory control, causing muscle rigidity and spasm.

破伤风患者中，闰绍细胞失去其功能，α运动神经元失去上级抑制，持续兴奋引起肌肉强直收缩和痉挛。

The motor neurons are deactivated and then, because the way you breathe is through motor neurons, you then die.

运动神经元被停用，然后，因为你的呼吸方式是通过运动神经元，你就会死去。

On one side of the gap, the motor neuron contains a neurotransmitter called acetylcholine.

在间隙的一侧，运动神经元含有一种称为乙酰胆碱的神经递质。