Thanks, good idea. So what I got, in words I can understand is:bagpuss wrote: ↑Thu Sep 30, 2021 2:34 pmI'm similarly under-educated in biology but I've found that the best way to make sense of unknown biological terms is to search specifically for images rather than all pages. I've just been doing exactly that on bits of ankle so it was the first thing I did when I read your post. If you do that for both endotheliopathy and endothelial cells, you'll find a whole host of diagrams, many specifically relating to COVID-19 as well, which should at least help make sense of all the words in the Wiki article, if not actually explain the whole thing.
The endothelium is a continuous membrane of cells lining the interior of the blood vessel. Endothelial cells release substances that control vascular relaxation and contraction as well as enzymes that control blood clotting, immune function and platelet (a colorless substance in the blood) adhesion. Endotheliopathy - ie malfunction of the endothelium - is frequently part of what is going on in heart diseases.