Finally, we discussed twitch summation versus tetanus, and isotonic vs. isometric movements.

最后，我们讨论了抽搐总和与强直，以及等张运动与等长运动。

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收缩是如何发生的，让我们看看我们的两种主要口味：等张和等长。

And 3% sodium chloride being saltier than isotonic 0.9% saline.

3%的氯化钠浓度高于0。9%的生理盐水。

If the temporal and recruitment summation triggers enough muscle tension in my arm to overcome the weight of the load and lift the mug, changing the length of the muscles involved during contraction, than that is an isotonic movement.

如果时间和招募的总和触发了我手臂上足够的肌肉张力来克服负荷的重量，举起杯子，改变收缩过程中肌肉的长度，那么这就是一个等张运动。