"The glomerulus is like a sieve which takes blood, filters it, and makes sure large molecules like proteins and cells don't get in to your urine. If there is a problem with the glomeruli, they get leaky, all sorts of stuff gets in to the urine that's not supposed to be there, and one of those things is a smaller protein called albumin."
The liquid goes through and the big stuff stays and gets moved back into the blood stream.
METAMIA is a free database of analogy and metaphor. Anyone can contribute or search. The subject matter can be anything. Science is popular, but poetry is encouraged. The goal is to integrate our fluid muses with the stark literalism of a relational database. Metamia is like a girdle for your muses, a cognitive girdle.