Urine thoughts

I was peeing into the loo and realized that I have never actually seen my bladder. I don't really know what it looks like. All I know is it is hollow and has two tubes going into it from my two kidneys and one tube to empty it. It sends a signal to my brain when it is nearly full and I need to go to the toilet. I wonder what shape it is in reality. I have never seen any of my internal organs. I only have a rough idea what they look like. I wonder if there are birth marks and things like that on organs

Knowing I need to take a pee is like a sense but it's not the sense of touch. We are told we have 5 senses but this can't be true. I can sense when I'm dehydrated and need to drink water,  I can sense what way is up and down, I can sense when I need to use the toilet. I can sense all sorts of things. I can even sense someone is standing behind me.