Contents 1 Structure 1.1 Development 1.2 Microanatomy 2 Function 2.1 Urine formation 2.1.1 Regulation of concentration and volume 2.2 Urination 3 Clinical significance 4 See also 5 References 6 External links

Structure[edit] The urinary system refers to the structures that produce and conduct urine to the point of excretion. The human body normally has two paired kidneys, one on the left and one on the right. Urine is formed by nephrons, the functional unit of the kidney, and then flows through a system of converging tubules called collecting ducts. The collecting ducts join together to form minor calyces, then major calyces, which ultimately join the pelvis of the kidney (renal pelvis). Urine flows from the renal pelvis into the ureter, a tube-like structure that carries the urine from the kidneys into the bladder. During urination, urine stored in the bladder is discharged through the urethra. In males, the urethra begins at the internal urethral orifice in the trigone of the bladder, continues through the external urethral orifice, and then becomes the prostatic, membranous, bulbar, and penile urethra. Urine exits through the external urethral meatus. The female urethra is much shorter, beginning at the bladder neck and terminating in the vaginal vestibule. Development[edit] Main article: Development of the urinary system Microanatomy[edit] See also: Urothelium Under microscopy, the urinary system is covered in a unique lining called urothelium, a type of transitional epithelium. Unlike the epithelial lining of most organs, transitional epithelium can flatten and distend. Urothelium covers most of the urinary system, including the renal pelvis, ureters, and bladder.

Function[edit] There are several functions of the Urinary System: Removal of waste product from the body (mainly urea and uric acid) Regulation of electrolyte balance (e.g. sodium, potassium and calcium) Regulation of acid-base homeostasis Controlling blood volume and maintaining blood pressure Urine formation[edit] Average urine production in adult humans is about 1–2 litres (L) per day, depending on state of hydration, activity level, environmental factors, weight, and the individual's health. Producing too much or too little urine requires medical attention. Polyuria is a condition of excessive urine production (> 2.5 L/day). Oliguria when < 400 mL (millilitres) are produced, and anuria one of < 100 mL per day. The first step in urine formation is the filtration of blood in the kidneys. In a healthy human the kidney receives between 12 and 30% of cardiac output, but it averages about 20% or about 1.25 L/min. The basic structural and functional unit of the kidney is the nephron. Its chief function is to regulate the concentration of water and soluble substances like sodium by filtering the blood, reabsorbing what is needed and excreting the rest as urine. In the first part of the nephron, Bowman's capsule filters blood from the circulatory system into the tubules. Hydrostatic and osmotic pressure gradients facilitate filtration across a semipermeable membrane. The filtrate includes water, small molecules, and ions that easily pass through the filtration membrane. However larger molecules such as proteins and blood cells are prevented from passing through the filtration membrane. The amount of filtrate produced every minute is called the glomerular filtration rate or GFR and amounts to 180 litres per day. About 99% of this filtrate is reabsorbed as it passes through the nephron and the remaining 1% becomes urine. The urinary system is regulated by the endocrine system by hormones such as antidiuretic hormone, aldosterone, and parathyroid hormone.[2] Regulation of concentration and volume[edit] The urinary system is under influence of the circulatory system, nervous system, and endocrine system. Aldosterone plays a central role in regulating blood pressure through its effects on the kidney. It acts on the distal tubules and collecting ducts of the nephron and increases reabsorption of sodium from the glomerular filtrate. Reabsorption of sodium results in retention of water, which increases blood pressure and blood volume. Antidiuretic hormone (ADH), is a neurohypophysial hormone found in most mammals. Its two primary functions are to retain water in the body and to constrict blood vessels. Vasopressin regulates the body's retention of water by increasing water reabsorption in the collecting ducts of the kidney nephron.[3] Vasopressin increases water permeability of the kidney's collecting duct and distal convoluted tubule by inducing translocation of aquaporin-CD water channels in the kidney nephron collecting duct plasma membrane.[4] Urination[edit] Main article: Urination Urination is the ejection of urine from the urinary bladder through the urethra to the outside of the body. In healthy humans (and many other animals), the process of urination is under voluntary control. In infants, some elderly individuals, and those with neurological injury, urination may occur as an involuntary reflex. Physiologically, micturition involves coordination between the central, autonomic, and somatic nervous systems. Brain centers that regulate urination include the pontine micturition center, periaqueductal gray, and the cerebral cortex. In placental mammals the male ejects urine through the penis, and the female through the vulva.

Clinical significance[edit] Main article: Urologic disease Urologic disease can involve congenital or acquired dysfunction of the urinary system. Diseases of the kidney tissue are normally treated by nephrologists, while disease of the urinary tract are treated by urologists. Gynecologists may also treat female urinary incontinence. Diseases of other bodily systems also have a direct effect on urogenital function. For instance it has been shown that protein released by the kidneys in diabetes mellitus sensitises the kidney to the damaging effects of hypertension.[5] Diabetes also can have a direct effect in urination due to peripheral neuropathies which occur in some individuals with poorly controlled diabetes.[6] Urinary incontinence can result from a weakening of the pelvic floor muscles caused by factors such as pregnancy, childbirth, aging and being overweight. Pelvic floor exercises known as Kegel exercises can help in this condition by strengthening the pelvic floor. There can also be underlying medical reasons for urinary incontinence which are often treatable. In children the condition is called enuresis.

See also[edit] Major systems of the human body Medicine portal

References[edit] ^ C. Dugdale, David (16 September 2011). "Female urinary tract". MedLine Plus Medical Encyclopedia.  ^ Maton, Anthea; Jean Hopkins; Charles William McLaughlin; Susan Johnson; Maryanna Quon Warner; David LaHart; Jill D. Wright (1993). Human Biology and Health. Englewood Cliffs, New Jersey, USA: Prentice Hall. ISBN 0-13-981176-1.  ^ Caldwell HK, Young WS III, Lajtha A, Lim R (2006). "Oxytocin and Vasopressin: Genetics and Behavioral Implications" (PDF). Handbook of Neurochemistry and Molecular Neurobiology: Neuroactive Proteins and Peptides (3rd ed.). Berlin: Springer. pp. 573–607. ISBN 0-387-30348-0.  ^ Nielsen S, Chou CL, Marples D, Christensen EI, Kishore BK, Knepper MA (February 1995). "Vasopressin increases water permeability of kidney collecting duct by inducing translocation of aquaporin-CD water channels to plasma membrane". Proc. Natl. Acad. Sci. U.S.A. 92 (4): 1013–7. doi:10.1073/pnas.92.4.1013. PMC 42627 . PMID 7532304.  ^ Baba, T; Murabayashi, S; Tomiyama, T; Takebe, K (1990). "Uncontrolled hypertension is associated with a rapid progression of nephropathy in type 2 diabetic patients with proteinuria and preserved renal function". The Tohoku journal of experimental medicine. 161 (4): 311–8. doi:10.1620/tjem.161.311. PMID 2256104.  ^ "Peripheral Neuropathy". Patient UK. Retrieved 2014-03-20. 

External links[edit] The Wikibook Human Physiology has a page on the topic of: The Urinary System The Wikibook Anatomy and Physiology of Animals has a page on the topic of: Urinary System Library resources about Urinary system Resources in your library v t e Anatomy of the urinary system Kidneys Layers Fascia Capsule Cortex column Medulla sinus pyramids medullary interstitium Lobe Cortical lobule Medullary ray Nephron Circulation Arteries Renal artery segmental interlobar arcuate interlobular afferent Veins Renal vein Peritubular capillaries Vasa recta arcuate interlobar efferent Nephron Renal corpuscle Glomerulus Bowman's capsule Glomerular basement membrane Podocyte Filtration slits Mesangium Intraglomerular mesangial cell Renal tubule Proximal convoluted tubule Loop of Henle Descending Thin ascending Thick ascending Distal convoluted tubule Connecting tubule Collecting ducts Tubular fluid Renal papilla Minor calyx Major calyx Renal pelvis Juxtaglomerular apparatus Macula densa Juxtaglomerular cells Mesangium Extraglomerular mesangial cell Ureters Ureteropelvic junction Bladder Apex Uvula Neck Median umbilical ligament Muscular layer Trigone Detrusor Mucosa Submucosa Urethra Urethral sphincters External sphincter male female Internal sphincter v t e Human systems and organs Musculoskeletal Skeletal system Bone Carpus Collar bone (clavicle) Thigh bone (femur) Fibula Humerus Mandible Metacarpus Metatarsus Ossicles Patella Phalanges Radius Skull Tarsus Tibia Ulna Rib Vertebra Pelvis Sternum Cartilage Joints Fibrous joint Cartilaginous joint Synovial joint Muscular system Muscle Tendon Diaphragm Circulatory system Cardiovascular system peripheral Artery Vein Lymphatic vessel Heart Lymphatic system primary Bone marrow Thymus secondary Spleen Lymph node CNS equivalent Glymphatic system Nervous system Brain Spinal cord Nerve Sensory system Ear Eye Integumentary system Skin Subcutaneous tissue Breast Mammary gland Immune system Myeloid Myeloid immune system Lymphoid Lymphoid immune system Respiratory system Upper Nose Nasopharynx Larynx Lower Trachea Bronchus Lung Digestive system Mouth Salivary gland Tongue upper GI Oropharynx Laryngopharynx Esophagus Stomach lower GI Small intestine Appendix Colon Rectum Anus accessory Liver Biliary tract Pancreas Urinary system Genitourinary system Kidney Ureter Bladder Urethra Reproductive system Female Uterus Vagina Vulva Ovary Placenta Male Scrotum Penis Prostate Testicle Seminal vesicle Endocrine system Pituitary Pineal Thyroid Parathyroid Adrenal Islets of Langerhans Authority control GND: 4023494-0 NDL: 00563231 Retrieved from "" Categories: Urinary systemHidden categories: Wikipedia pending changes protected pagesWikipedia articles with GND identifiers

Navigation menu Personal tools Not logged inTalkContributionsCreate accountLog in Namespaces ArticleTalk Variants Views ReadEditView history More Search Navigation Main pageContentsFeatured contentCurrent eventsRandom articleDonate to WikipediaWikipedia store Interaction HelpAbout WikipediaCommunity portalRecent changesContact page Tools What links hereRelated changesUpload fileSpecial pagesPermanent linkPage informationWikidata itemCite this page Print/export Create a bookDownload as PDFPrintable version In other projects Wikimedia Commons Languages العربيةAzərbaycancaBosanskiBrezhonegCatalàČeštinaCymraegDeutschދިވެހިބަސްΕλληνικάEspañolEsperantoEuskaraفارسیFrançaisGaeilgeGalego한국어ՀայերենHrvatskiBahasa IndonesiaItalianoעבריתBasa JawaҚазақшаKreyòl ayisyenKurdîКыргызчаLatviešuLietuviųNederlands日本語NorskPortuguêsRomânăРусскийScotsShqipSimple EnglishSlovenčinaSlovenščinaکوردیСрпски / srpskiSrpskohrvatski / српскохрватскиSuomiSvenskaTagalogதமிழ்Татарча/tatarçaతెలుగుไทยТоҷикӣTürkçeУкраїнськаTiếng ViệtWalon粵語中文 Edit links This page was last edited on 9 January 2018, at 04:34. Text is available under the Creative Commons Attribution-ShareAlike License; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization. Privacy policy About Wikipedia Disclaimers Contact Wikipedia Developers Cookie statement Mobile view (window.RLQ=window.RLQ||[]).push(function(){mw.config.set({"wgPageParseReport":{"limitreport":{"cputime":"0.292","walltime":"0.401","ppvisitednodes":{"value":1907,"limit":1000000},"ppgeneratednodes":{"value":0,"limit":1500000},"postexpandincludesize":{"value":85626,"limit":2097152},"templateargumentsize":{"value":2158,"limit":2097152},"expansiondepth":{"value":12,"limit":40},"expensivefunctioncount":{"value":4,"limit":500},"entityaccesscount":{"value":1,"limit":400},"timingprofile":["100.00% 329.662 1 -total"," 28.31% 93.326 1 Template:Infobox_anatomy"," 25.28% 83.341 1 Template:Reflist"," 24.13% 79.541 1 Template:Infobox"," 14.40% 47.456 1 Template:Pp-pc1"," 12.31% 40.586 2 Template:Cite_web"," 10.54% 34.755 6 Template:Navbox"," 7.25% 23.884 1 Template:Human_systems_and_organs"," 6.88% 22.684 4 Template:Main_other"," 4.86% 16.034 1 Template:Urinary_system_anatomy"]},"scribunto":{"limitreport-timeusage":{"value":"0.133","limit":"10.000"},"limitreport-memusage":{"value":4285800,"limit":52428800}},"cachereport":{"origin":"mw1218","timestamp":"20180112015418","ttl":1900800,"transientcontent":false}}});});(window.RLQ=window.RLQ||[]).push(function(){mw.config.set({"wgBackendResponseTime":523,"wgHostname":"mw1218"});});

Urinary_system - Photos and All Basic Informations

Urinary_system More Links

All Edits By Unregistered And New Users Are Subject To Review Prior To Becoming Visible To Unregistered UsersWikipedia:Pending ChangesKidneyRenal PelvisUreterUrinary BladderUrethraFrontal PlaneAdrenal GlandRenal ArteryRenal VeinInferior Vena CavaAbdominal AortaCommon Iliac ArteryCommon Iliac VeinLiverLarge IntestinePelvisKidneyUretersUrinary BladderUrethraLatinTerminologia AnatomicaFoundational Model Of AnatomyAnatomical TerminologyKidneysUretersUrinary BladderUrethraNephronsUrineUrinationVoidingBloodMillilitersUrineKidneyNephronCollecting Duct SystemMinor CalyxMajor CalyxRenal PelvisUreterBladderUrethraTrigone Of Urinary BladderVaginaDevelopment Of The Urinary SystemUrotheliumUrotheliumTransitional EpitheliumEpitheliumUreaUric AcidElectrolyteSodiumPotassiumCalciumAcid-base HomeostasisBlood VolumeBlood PressureLitresPolyuriaOliguriaAnuriaCardiac OutputNephronConcentrationWaterSodium SaltBloodUrineBowman's CapsuleCirculatory SystemProteinsBlood CellGlomerular Filtration RateEndocrine SystemHormoneAntidiuretic HormoneAldosteroneParathyroid HormoneCirculatory SystemNervous SystemEndocrine SystemAldosteroneNeurohypophysial HormoneMammalsWater Retention (medicine)UrinationUrineUrinary BladderUrethraUrinationReflexCentral Nervous SystemAutonomic Nervous SystemSomatic Nervous SystemPontine Micturition CenterPeriaqueductal GrayCerebral CortexPlacentaliaPenisVulvaUrologic DiseaseUrologic DiseaseNephrologistUrologistGynecologyProteinDiabetes MellitusHypertensionDiabetesUrinationPeripheral NeuropathyUrinary IncontinencePelvic FloorPregnancyChildbirthAgeingOverweightKegel ExerciseEnuresisMajor Systems Of The Human BodyPortal:MedicineInternational Standard Book NumberSpecial:BookSources/0-13-981176-1International Standard Book NumberSpecial:BookSources/0-387-30348-0Digital Object IdentifierPubMed CentralPubMed IdentifierDigital Object IdentifierPubMed IdentifierWikipedia:LIBRARYTemplate:Urinary System AnatomyTemplate Talk:Urinary System AnatomyKidneyRenal FasciaRenal CapsuleRenal CortexRenal ColumnRenal MedullaRenal SinusRenal PyramidsMedullary InterstitiumRenal LobeCortical LobuleMedullary Ray (anatomy)NephronRenal CirculationRenal ArterySegmental Arteries Of KidneyInterlobar ArteriesArcuate Arteries Of The KidneyInterlobular ArteriesAfferent ArteriolesRenal VeinPeritubular CapillariesVasa RectaArcuate VeinInterlobar VeinsEfferent ArterioleNephronRenal CorpuscleGlomerulus (kidney)Bowman's CapsuleGlomerular Basement MembranePodocyteFiltration SlitsMesangiumIntraglomerular Mesangial CellRenal TubuleProximal Convoluted TubuleLoop Of HenleDescending Limb Of Loop Of HenleAscending Limb Of Loop Of HenleAscending Limb Of Loop Of HenleDistal Convoluted TubuleConnecting TubuleCollecting Duct SystemTubular FluidRenal PapillaRenal CalyxRenal CalyxRenal PelvisJuxtaglomerular ApparatusMacula DensaJuxtaglomerular CellMesangiumExtraglomerular Mesangial CellUreterUreteropelvic JunctionUrinary BladderApex Of Urinary BladderUvula Of Urinary BladderNeck Of Urinary BladderMedian Umbilical LigamentMuscular LayerTrigone Of Urinary BladderDetrusor Urinae MuscleMucous MembraneSubmucosaUrethraUrethral SphinctersExternal Sphincter Muscle Of Male UrethraExternal Sphincter Muscle Of Female UrethraInternal Urethral SphincterTemplate:Human Systems And OrgansTemplate Talk:Human Systems And OrgansHuman BodyOrgan (anatomy)Human Musculoskeletal SystemHuman SkeletonBoneCarpal BonesClavicleFemurFibulaHumerusMandibleMetacarpal BonesMetatarsal BonesOssiclesPatellaPhalanx BoneRadius (bone)SkullTarsus (skeleton)TibiaUlnaRibVertebral ColumnPelvisSternumCartilageJointFibrous JointCartilaginous JointSynovial JointMuscular SystemMuscleTendonThoracic DiaphragmCirculatory SystemCirculatory SystemArteryVeinLymphatic VesselHeartLymphatic SystemBone MarrowThymusSpleenLymph NodeGlymphatic SystemNervous SystemHuman BrainSpinal CordNerveSensory SystemEarHuman EyeIntegumentary SystemHuman SkinSubcutaneous TissueBreastMammary GlandImmune SystemMyeloidImmune SystemLymphocyteImmune SystemRespiratory SystemRespiratory TractHuman NosePharynxLarynxRespiratory TractTracheaBronchusLungHuman Digestive SystemHuman MouthSalivary GlandTonguePharynxPharynxEsophagusStomachSmall IntestineAppendix (anatomy)Large IntestineRectumHuman AnusHuman Digestive SystemLiverBiliary TractPancreasGenitourinary SystemKidneyUreterUrinary BladderUrethraReproductive SystemFemale Reproductive SystemUterusVaginaVulvaOvaryPlacentaMale Reproductive SystemScrotumHuman PenisProstateTesticleSeminal VesicleEndocrine SystemPituitary GlandPineal GlandThyroidParathyroid GlandAdrenal GlandPancreatic IsletsHelp:Authority ControlIntegrated Authority FileNational Diet LibraryHelp:CategoryCategory:Urinary SystemCategory:Wikipedia Pending Changes Protected PagesCategory:Wikipedia Articles With GND IdentifiersDiscussion About Edits From This IP Address [n]A List Of Edits Made From This IP Address [y]View The Content Page [c]Discussion About The Content Page [t]Edit This Page [e]Visit The Main Page [z]Guides To Browsing WikipediaFeatured Content – The Best Of WikipediaFind Background Information On Current EventsLoad A Random Article [x]Guidance On How To Use And Edit WikipediaFind Out About WikipediaAbout The Project, What You Can Do, Where To Find ThingsA List Of Recent Changes In The Wiki [r]List Of All English Wikipedia Pages Containing Links To This Page [j]Recent Changes In Pages Linked From This Page [k]Upload Files [u]A List Of All Special Pages [q]Wikipedia:AboutWikipedia:General Disclaimer

view link view link view link view link view link