system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do some fluids like blood and egg yolk become solids at higher temperatures instead of low temperatures?
gpt
Protein denaturation. Proteins consist of long chains of what are known as amino acids, these chains often fold into various three dimensional shapes because this gives them their properties, proteins are basically the molecules that do 90% of the work in your body and pretty much the most important molecule for life. Anyways, this folding into long chains can be disrupted by high heat, this causes what is known as denaturation, or unfolding into the chain. Both of these liquids are protein rich, and what happens is that all these proteins denature but often they will "interlock" when trying to refold again, causing a more solid state to occur.