I remember from high school biology that cells form tissues and then from these tissues organs are created, etc.
However what’s not clear for me is: What stops a cell tissue from totally collapsing back to a clump of cells? Why animals, plants and even some fungi don’t just… Melt?
In: 7
[Cadherin](https://en.wikipedia.org/wiki/Cadherin) and other [cell adhesion molecules](https://en.wikipedia.org/wiki/Cell_adhesion_molecule) like it connect the cell membranes of neighbouring cells. Outside the cells, there is something called the [extracellular matrix](https://en.wikipedia.org/wiki/Extracellular_matrix). That’s where stuff like collagen and hyaluronic acid exists to give structural integrity.
Highschool biology casually ignores all of that because it only has a limited amount of time to teach the basics of what possibly is the most complex natural science.
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