Jonathan writes
I’m wondering about the process of a bladder filling up. Does it happen via some kind of “trickle” method, or is it some sort of gradual seepage? At what percentage “full” does the need to micturate register? The admittedly minimal research I’ve done online seems to indicate that most people are more interested in the expulsion of urine rather than the process of its collection. Perhaps you can shed some light on this.
Ok so correct me if I’m wrong but the use of “trickle” and “seepage” there seems to be a way of saying direct or indirect fill; you seem to be asking if the bladder has a delivery system or whether it fills a bit like a sponge.