Imagine if you could do the same with behaviors — if you could just as easily assign behaviors to a table cell, like expand and collapse, highlight or scroll, as you could set its background color.

The main pathological change is collapse of lung which can result in lacking of oxygen , breath obstacle and cell degeneration.

Preface, the following is just for reference. it has been proved that the closed cell with single way valve will make the paraglider can not recover properly after collapse, don't try it at home.