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Vampires
Urinary System

How do you urinate?

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Wiki User
2010-08-08 05:45:26

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

urinate.

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

body.

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

control.

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

incontinent.


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