{"id":80879,"date":"2018-05-02T14:11:32","date_gmt":"2018-05-02T14:11:32","guid":{"rendered":"http:\/\/humanitasnet-new.local\/enciclopedia\/stitna-zlezda\/"},"modified":"2018-05-02T14:11:32","modified_gmt":"2018-05-02T14:11:32","slug":"stitna-zlezda","status":"publish","type":"enciclopedia","link":"https:\/\/humanitas-net.humweb.webiz.team\/sr\/wiki\/stitna-zlezda\/","title":{"rendered":"\u0160titna \u017elezda"},"content":{"rendered":"<p>\u0160titna ili \u0161titasta \u017elezda je deo endokrinog sistema kod ljudi. Ova \u017elezda nalazi se na granici izme\u0111u grkljana i du\u0161nika, u predelu donjeg dela vrata. \u0160titna \u017elezda je pod neposrednom kontrolom hipofize, a njena glavna uloga je proizvodnja i lu\u010denje hormona \u0161titne \u017elezde, odnosno tiroidnih hormona, koji su neophodni za normalan rast i razvoj organizma kao i za odr\u017eavanje normalnog rada organizma.<\/p>\n<p>&nbsp;<\/p>\n<h2 id=\"sta-je-stitna-zlezda\">\u0160ta je \u0161titna \u017elezda?<\/h2>\n<p>\u0160titna, odnosno tireoidna \u017elezda nalazi se u vratnom delu neposredno ispod grkljana, a ispred i sa strana du\u0161nika. Pri\u010dvr\u0161\u0107ena se za tireoidnu hrskavicu koja se nalazi u grkljanu i pokre\u0107e se prilikom gutanja. \u0160titna \u017elezda jedna je od ve\u0107ih endokrinih \u017elezda, odnosno \u017elezda sa unutra\u0161njim lu\u010denjem, i njena te\u017eina iznosi izme\u0111u 10 i 20 grama.<\/p>\n<p>&nbsp;<\/p>\n<p>Ova \u017elezda sastoji se od dva re\u017enja &#8211; levog i desnog. Ova dva re\u017enja me\u0111usobno su povezani su\u017eenjem koje se naziva istmus i nalazi se u visinu 2. i 3. hrskavice du\u0161nika. U nekim slu\u010dajevima javlja se i tre\u0107i, piramidalni re\u017eanj koji se nalazi u srednjem delu \u0161titne \u017elezde. Ovaj re\u017eanj predstavlja embrionalni zaostatak i retko kada vr\u0161i neku funkciju. Re\u017enjevi \u0161titne \u017elezde oblika su trostrane piramide \u010diji je vrh usmeren navi\u0161e. Zbog specifi\u010dnog polo\u017eaja ova \u017elezda se mo\u017ee vrlo lako napipati radi pregledanja. Para\u0161titne, odnosno para\u0161titaste \u017elezde nalaze se iza re\u017enjeva \u0161tine \u017elezde.<\/p>\n<p>&nbsp;<\/p>\n<p>U oba re\u017enja ove \u017elezde nalazi se veliki broj manjih re\u017enji\u0107a koji nastaju kao posledica podele re\u017enjeva pomo\u0107u fibrozne \u010daure kojom je ova \u017elezda obmotana. Ova fibrozna \u010daura pru\u017ea se u dubinu \u017elezde i gradi fibrozne pregrade koje su izgra\u0111ene od folikula. Folikuli su osnovna funkcionalna jedinica \u0161titne \u017elezde, i oblo\u017eeni su bazalnom membranom na kojoj se nalazi sloj kockastih epitelnih \u0107elija. Ove \u0107elije lu\u010de koloid u unutra\u0161njost folikula. Koloid je supstanca koja u sebi sadr\u017ei glikoprotein velike molekularne mase, \u010dijim razlaganjem nastaju hormoni \u0161titaste \u017elezde. Izme\u0111u epitelnih \u0107elija nalaze se i C-\u0107elije, odnosno parafolikularne \u0107elije. Ove \u0107elije lu\u010de kalcitonin, polipeptidni hormon koji ima ulogu u regulaciji koncentracije kalcijuma u krvi. \u0160titna \u017elezda proizvodi i lu\u010di hormone tiroksin, tironin i kalcitonin u krv. Tironin (T3) je aktivna forma hormona koja nastaje iz aminokiseline tirozin i sadr\u017ei u sebi 3 atoma joda. Tiroksin (T4) tako\u0111e nastaje iz iste aminokiseline kao i tironin, ali sadr\u017ei 4 atoma joda. \u0160titna \u017elezda u najve\u0107oj meri lu\u010di ovaj hormon.<\/p>\n<p>&nbsp;<\/p>\n<h2 id=\"koja-je-funkcija-stitne-zlezde\">Koja je funkcija \u0161titne \u017elezde?<\/h2>\n<p>\u0160titna ili \u0161titasta \u017elezda je deo endokrinog sistema kod ljudi. Ova \u017elezda nalazi se na granici izme\u0111u grkljana i du\u0161nika, u predelu donjeg dela vrata. \u0160titna \u017elezda je pod neposrednom kontrolom hipofize, a njena glavna uloga je proizvodnja i lu\u010denje hormona \u0161titne \u017elezde, odnosno tiroidnih hormona, koji su neophodni za normalan rast i razvoj organizma kao i za odr\u017eavanje normalnog rada organizma.<\/p>\n<p>&nbsp;<\/p>\n<p>\u0160titna \u017elezda lu\u010di hormone koji dovode do pove\u0107anja bazalnog metabolizma, pove\u0107anja aktivnosti endokrinih \u017elezda kao i lu\u010denja insulina, podsticanja rasta i razvijanja mozga u fetalnom periodu, kao i ubrzavanja procesa razgradnje masti iz masnog tkiva. \u0160titna \u017elezda tako\u0111e uti\u010de i na pove\u0107anje rada i snage srca, pove\u0107anje snage mi\u0161i\u0107ne kontrakcije, a omogu\u0107ava i normalnu seksualnu funkciju i kod mu\u0161karaca i kod \u017eena.<\/p>\n","protected":false},"featured_media":0,"parent":0,"template":"","Example":[1789],"class_list":["post-80879","enciclopedia","type-enciclopedia","status-publish","hentry","enciclopedia_category-anatomija"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u0160titna \u017elezda - Humanitas.net<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"sr_RS\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u0160titna \u017elezda - Humanitas.net\" \/>\n<meta property=\"og:description\" content=\"\u0160titna ili \u0161titasta \u017elezda je deo endokrinog sistema kod ljudi. 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