You can get a little muscular contraction on your face.

你的脸上会有一点肌肉收缩的感觉。

It's a joke. It relies on the homonymic relationship between " tick, " the bloodsucking arachnid, and " tic, " the involuntary muscular contraction.

这是笑话，同音词嘛" tick" 是指吸血蜘蛛，而" tic" 是无意识的肌肉痉挛。

Quiet inspiration requires muscular contraction and is, therefore, an active process.

平静吸气需要肌肉收缩，因此是一个积极的过程。

Let's break down ventilation and see exactly where muscular contraction is required.

我们分解通气系统，看清楚哪里需要肌肉收缩。

However, quiet expiration is a passive process, as it requires no muscular contraction.

然而，安静呼气是一个被动的过程，因为它不需要肌肉收缩。

Forced inspiration and expiration require muscular contraction, and therefore, they're both active processes.

强迫吸气和呼气需要肌肉收缩，因此，它们都是活跃的过程。

Under resting conditions, expiration is passive, as no muscular contraction is needed.

在休息状态下，呼气是被动的，因为不需要肌肉收缩。

Nerves in the surrounding esophageal tissue sense the bolus's presence and trigger peristalsis, a series of defined muscular contractions.

周围食管组织中的神经感知推注的存在并触发蠕动，这是一系列明确的肌肉收缩。

Specifically, our cells need the oxygen to make ATP, which then provides energy for work: for example, muscular contraction.

具体来说，我们的细胞需要氧气来制造ATP，然后ATP为工作提供能量：例如，肌肉收缩。

The various cells of our body use oxygen to make ATP, and then that provides the energy for the cell to do work - for example, muscular contraction.

我们身体的各种细胞利用氧气制造ATP，然后为细胞提供能量来工作——例如肌肉收缩。