system
Given the following post, respond as if you're commenting on Reddit:
human
What determines when we have to pee?

When we pee we don't excrete the same amount of fluid each time, so the procces of determening when you have to pee can't only rely on when the blader is full can it?
gpt
Many factors go into the volume of your urine when you need to go. There are little stretch receptors in the bladder that signal the brain when it needs to go but there are also other signals that can trigger it when not completely full. Stress and anxiety and cause muscular tension that can make someone have to pee.  Fear and the fight or flight response can also cause someone to release their bladder. A full bladder isn't always the cause of the signal to the brain and it can definitely happen at different volumes.