What is that threshold or extra “push” when you take a deep breath or yawn?

Question

Like your lungs fill up as usual, but this time there’s this extra “push” that feels so refreshing

Edit: I forgot the colon after and that just feels gross

In: Biology

Answer 1

Your lungs don’t fill up as usual. A normal breathing cycle barely goes thorough 20% of your total lung capacity. When you yawn or deep breathe, you inhale up to 40% total capacity more. And when you exhale forcefully you get an additional 20% out (percentages approx). You always keep about 20% in just to keep the lungs inflated and not collapsed.

[check this for more info, click on the graph on the right. ](https://en.wikipedia.org/wiki/Lung_volumes)