system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: When you've eaten food and drunk fluids,how does your body separate solids into your bowel and liquid into your bladder?
gpt
Well, your body is a pretty smart assorter.

The quick pass through your body involves both food and drink travelling from your mouth, down a long muscular tube to the stomach, and then gradually reabsorbed from the long intestines within.

 Food and drinks get subjected to several special juices called enzymes that break it into simple compounds like glucose, basic proteins and fats.

Most of the water that you drink and the water in your food is absorbed by your gut with glucose. It enters your bloodstream and goes to the liver for processing before going to the rest of the body.

Urine is a very fine filtration of your blood. Your blood now carries loads of nutrients and a few waste products. So the kidney sorts it out and produces urine. 

Whatever can't be absorbed in the gut, stays in the tubes and is converted by local bacteria into poop.