system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What is snot and how can I produce a seemingly infinite amount when I have a cold?
gpt
Your nose (and the rest of your respiratory tract) produces mucus (snot). It is always being produced and pushed up and out of your nose or into your oesophagus (which leads to the stomach). Its function is to trap inhaled particles (like dust) and microbes so they can be removed without entering the sensitive parts of the system.

When you have a cold, you have an infection. This causes your body to put mucus production into overdrive as there's more germs to get rid of.