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It is commonly believed that in infants, voiding occurs involuntarily (as a reflex).

However, the practice of elimination communication suggests otherwise.

The ability to voluntarily inhibit micturition develops by the age of 2–3 years, as control at higher levels of the central nervous system develops.

In the adult, the volume of urine in the bladder that normally initiates a reflex contraction is about 300–400 millilitres (11–14 imp fl oz; 10–14 US fl oz).

At high bladder volumes, afferent firing increases, causing a conscious sensation of urinary urge.When the bladder is fully distended the superficial cells become squamous (flat) and the stratification of the cuboidal cells is reduced in order to provide lateral stretching.The physiology of micturition and the physiologic basis of its disorders are subjects about which there is much confusion, especially at the supraspinal level. Here you can find beautiful girls wearing all kinds of lingerie, sexy pantyhose, panties, bra and bikini.Urination is the release of urine from the urinary bladder through the urethra to the outside of the body. It is also known medically as micturition, voiding, uresis, or, rarely, emiction, and known colloquially by various names including peeing, weeing, and pissing.

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