Urination

urinateurinatingmicturitionspraying urinevoidingurine sprayingpublic urinationurinatedurinatespiss
Urination is the release of urine from the urinary bladder through the urethra to the outside of the body.wikipedia
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Urine

urinaryhuman urinepiss
Urination is the release of urine from the urinary bladder through the urethra to the outside of the body.
Urination results in urine being excreted from the body through the urethra.

Urinary system

urinary tracturinaryrenal system
It is the urinary system's form of excretion.
Following filtration of blood and further processing, wastes (in the form of urine) exit the kidney via the ureters, tubes made of smooth muscle fibres that propel urine towards the urinary bladder, where it is stored and subsequently expelled from the body by urination (voiding).

Autonomic nervous system

autonomicautonomous nervous systemautonomic functions
Physiologically, urination involves coordination between the central, autonomic, and somatic nervous systems.
The autonomic nervous system is a control system that acts largely unconsciously and regulates bodily functions such as the heart rate, digestion, respiratory rate, pupillary response, urination, and sexual arousal.

Penis

peniledickcock
In placental mammals, urine is drained through the urinary meatus, a urethral opening in the male penis or female vulval vestibule.
In most species of animals in which there is an organ that might reasonably be described as a penis, it has no major function other than intromission, or at least conveying the sperm to the female, but in the placental mammals the penis bears the distal part of the urethra, which discharges both urine during urination and semen during copulation.

Diuresis

osmotic diuresisforced diuresisimmersion diuresis
Diuresis (production of urine by the kidney) occurs constantly, and as the bladder becomes full, afferent firing increases, yet the micturition reflex can be voluntarily inhibited until it is appropriate to begin voiding.
Diuresis is increased urination and the physiologic process that produces such an increase.

Parasympathetic nervous system

parasympatheticparasympathetic nerveparasympathetic nerves
The smooth muscle of the bladder, known as the detrusor, is innervated by sympathetic nervous system fibers from the lumbar spinal cord and parasympathetic fibers from the sacral spinal cord.
The parasympathetic system is responsible for stimulation of "rest-and-digest" or "feed and breed" activities that occur when the body is at rest, especially after eating, including sexual arousal, salivation, lacrimation (tears), urination, digestion and defecation.

Urinary incontinence

incontinenceurinaryincontinent
Urinary incontinence, the inability to hold urine
Urinary incontinence (UI), also known as involuntary urination, is any uncontrolled leakage of urine.

Pontine micturition center

Barrington's nucleuscentral nervous system
Brain centers that regulate urination include the pontine micturition center, periaqueductal gray, and the cerebral cortex. Micturition is fundamentally a spinobulbospinal reflex facilitated and inhibited by higher brain centers such as the pontine micturition center and, like defecation, subject to voluntary facilitation and inhibition.
The Pontine micturition center (PMC, also known as Barrington's nucleus) is a collection of neuronal cell bodies located in the rostral pons in the brainstem involved in the supraspinal regulation of micturition.

Cystometry

cystometrogram
A plot of bladder (intravesical) pressure against the depressant of fluid in the bladder (called a cystometrogram), will show a very slight rise as the bladder is filled.
Specifically, it measures contractile force of the bladder when voiding.

Overactive bladder

urge incontinencebladder spasmincontinence
Urge incontinence, incontinence that occurs as a result of the uncontrollable urge to urinate
Overactive bladder (OAB) is a condition where there is a frequent feeling of needing to urinate to a degree that it negatively affects a person's life.

Urinary meatus

meatusurethral meatusurinary opening
In placental mammals, urine is drained through the urinary meatus, a urethral opening in the male penis or female vulval vestibule.
It presents as a vertical slit, possibly bounded on either side by two small labia-like projections and continues longitudinally along the front aspect of the glans, which facilitates the flow of urine micturition.

Urinary tract infection

urinary tract infectionscystitisbladder infection
Urinary tract infection, which can cause urinary frequency and dysuria
Symptoms from a lower urinary tract include pain with urination, frequent urination, and feeling the need to urinate despite having an empty bladder.

Urethra

male urethraurethralfemale urethra
Urination is the release of urine from the urinary bladder through the urethra to the outside of the body.
The external urethral sphincter is a striated muscle that allows voluntary control over urination.

External sphincter muscle of female urethra

female external urethral sphincterexternal urethral sphincterfemale external sphincter
Part of the urethra is surrounded by the male or female external urethral sphincter, which is innervated by the somatic pudendal nerve originating in the cord, in an area termed Onuf's nucleus.
The external sphincter muscle of female urethra is a muscle which controls urination in females.

Dysuria

burning with urinationpainful urinationpain with urination
Urinary tract infection, which can cause urinary frequency and dysuria
In medicine, specifically urology, dysuria refers to painful urination.

Paruresis

cannot urinate in publicshy bladder syndromeunable to urinate
Paruresis, the inability to urinate in the presence of others, such as in a public toilet.
Paruresis is a type of phobia in which the sufferer is unable to urinate in the real or imaginary presence of others, such as in a public restroom.

Antidiuretic

antidiuresisantidiuretic agentsantinatriuretic
A drug that increases urination is called a diuretic, whereas antidiuretics decrease the production of urine by the kidneys.
An antidiuretic is a substance that helps to control fluid balance in an animal's body by reducing urination, opposing diuresis.

Detrusor muscle

detrusordetrusor urinae muscledetrusor muscles
The smooth muscle of the bladder, known as the detrusor, is innervated by sympathetic nervous system fibers from the lumbar spinal cord and parasympathetic fibers from the sacral spinal cord.
The detrusor muscle remains relaxed to allow the bladder to store urine, and contracts during urination to release urine.

Micturition syncope

Micturition syncope, a vasovagal response which may cause fainting.
Micturition syncope or post-micturition syncope is the name given to the human phenomenon of fainting shortly after or during urination.

Internal urethral sphincter

internal sphincterinternal sphincter muscle of urethra
Smooth muscle bundles pass on either side of the urethra, and these fibers are sometimes called the internal urethral sphincter, although they do not encircle the urethra.
During urination it is relaxed via branches from the inferior hypogastric plexus (S2-S4) parasympathetic nervous system.

Female urination device

funnelpersonal funnelsstand-to-pee
An alternative method for women to urinate standing is to use a tool known as a female urination device to assist.
A female urination device, female urination aid, or stand-to-pee device (STP) is a device which aids a woman or girl to urinate while standing upright.

Overflow incontinence

It becomes overfilled, and urine dribbles through the sphincters (overflow incontinence).
Overflow incontinence is a form of urinary incontinence, characterized by the involuntary release of urine from an overfull urinary bladder, often in the absence of any urge to urinate.

Defecation

defecatedefecatingbowel movement
Micturition is fundamentally a spinobulbospinal reflex facilitated and inhibited by higher brain centers such as the pontine micturition center and, like defecation, subject to voluntary facilitation and inhibition.
This explains why defecation is frequently accompanied by urination.

Urinal (health care)

urinalurinal in bottle form
Sometimes urination is done in a container such as a bottle, urinal, bedpan, or chamber pot (also known as a gazunder).
A urinal is a bottle for urination.

Toilet

toiletslavatorylavatories
It is socially more accepted and more environmentally hygienic for those who are able, to urinate in a toilet.
In other words: "Toilets are sanitation facilities at the user interface that allow the safe and convenient urination and defecation".