#creation

My new favourite cells are the umbrella cells of the urothelium. They are actually the most awesome thing ever. Their apical surface has specialised structures
- inflexible plaques
- folded bits of floppy membrane
Soooo when your bladder is not full, the inflexible plaques are able to fold the floppy bits of membrane away, just like an umbrella. But when your bladder is full, these folded bits are able to unfurl - allowing your bladder (and ureters) to stretch without tearing the cell membrane, and thus compromise the barrier function of the urothelium. Honestly, one of the coolest cell types ever.