How do you urinate?
The body has specific mechanisms for when the bladder will
release urine, and how it releases urine.
First, the brain is always in a "go ahead and go" setting for
urination. When the brain turns off that mechanism (like switching
to a "don't go" or neutral setting), that is when we can
Second, the kidneys have been continuously filtering "fluids"
from the cells, blood coming from the heart, and intestines. This
is not just what we drink, but from physical processes in the
Third, the kidneys release urine into a holding area called the
urinary bladder. It has a sphincter at the lowest part, right where
it connects to the ureter (a tube that goes to the outside). At the
other end, the ureter has a second sphincter. A sphincter is a
muscle ring-like structure that keeps the tube closed. When the
brain registers urinary bladder pressure, and turns the "always go"
signal off, then the brain sends a message to the sphincters to
open. But part of the sphincter opening is under voluntary
Each person is normally at the urinal / on the toilet when the
sphincters relax so that we urinate. Sometimes this whole process
goes haywire. For example, older men may have an enlarged prostate
gland so they cannot urinate completely. Older women may be