{"id":49778,"date":"2018-05-07T08:16:29","date_gmt":"2018-05-07T08:16:29","guid":{"rendered":"https:\/\/www.humanitas.net\/?post_type=wiki&#038;p=49778"},"modified":"2018-05-07T08:16:29","modified_gmt":"2018-05-07T08:16:29","slug":"vene-venski-sistem","status":"publish","type":"wiki","link":"https:\/\/www.humanitas.net\/sr\/wiki\/anatomija\/vene-venski-sistem\/","title":{"rendered":"Vene i venski sistem"},"content":{"rendered":"<h2>\u0160ta predstavljaju vene i venski sistem?<\/h2>\n<p>Vene su krvni sudovi odgovorni za dovo\u0111enje krvi iz perifernih delova tela u srce (centripetalna sila). Uz izuzetak plu\u0107nih vena koje prenose krv bogatu kiseonikom i hranljivim materijama, sve ostale vene prenose krv sa ugljen-dioksidom i otpadnim materijama do plu\u0107a gde se vr\u0161i razmena gasova.<\/p>\n<p>&nbsp;<\/p>\n<p>Zavisno od pre\u010dnika krvnih sudova, vene su dele na sitne i velike sa ve\u0107im pre\u010dnikom, pa tako razlikujemo slede\u0107e: venske kapilare, venule, male vene, srednje vene i velike vene. Zidovi vena izgra\u0111eni su od tri sloja koji nale\u017eu jedan na drugi (spolja\u0161nji, srednji i unutra\u0161nji slooj), oni su tanji od zida arterija i karakteri\u0161u se prisustvom elasti\u010dne mi\u0161i\u0107ne komponente.<\/p>\n<p>&nbsp;<\/p>\n<p>Glavne strukture koje formiraju venski sistem su:<\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li>Plu\u0107ne vene<\/li>\n<li>Vena cava inferior (donja \u0161uplja vena)<\/li>\n<li>Vena cava superior (gornja \u0161uplja vena)<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h2>Plu\u0107ne vene<\/h2>\n<p>Plu\u0107ne vene su odgovorne za prenos krvi bogate kiseonikom od plu\u0107a do srca (leve sr\u010dane pretkomore), koja se zatim ispumpava u ostale delove tela. Zajedno sa plu\u0107nim arterijama, one \u010dine plu\u0107ni krvotok (koji se jo\u0161 zove i &#8220;krvotok izme\u0111u srca i plu\u0107a&#8221; ili &#8220;mali krvotok&#8221;) ili deo sistema krvotoka. Plu\u0107na cirkulacija je deo kardiovaskularnog sistema odgovorna za prenos krvi sa ugljen-dioksidom i otpadnim materijama iz svih organa i tkiva od srca do plu\u0107a, i vra\u0107anja krvi oboga\u0107ene kiseonikom nazad u srce, kao i za prenos krvi bogate hranljivim materijama do ostalih organa i tkiva.<\/p>\n<p>&nbsp;<\/p>\n<h2>Donja \u0161uplja vena<\/h2>\n<p>Vena cava inferior, koja se jo\u0161 naziva i zadnja \u0161uplja vena je najve\u0107a vena ljudskog organizma. Ona je odgovorna za prenos krvi bez kiseonika iz donjih delova tela (donjih ekstremiteta i svih organa sme\u0161tenih ispod dijafragme) do srca. Sme\u0161tena je prete\u017eno u trbu\u0161nom delu (samo mali deo nalazi se u grudnom ko\u0161u), nalazi se iza trbu\u0161ne \u0161upljine i pru\u017ea se vertikalno du\u017e desne strane ki\u010dmenog stuba. Ulayi u desnu pretkomoru sa ni\u017ee desne strane yadnjeg sr\u010danog zida.<\/p>\n<p>&nbsp;<\/p>\n<p>Donja \u0161uplja vena duga\u010dka je oko 22 cm (18 cm se nalazi u trbu\u0161nom delu) dok joj je pre\u010dnik oko 30mm.<\/p>\n<p>&nbsp;<\/p>\n<h2>Gornja \u0161uplja vena<\/h2>\n<p>Gornja \u0161uplja vena je velika vena sme\u0161tena u gornjem prednjem medijastinumu. Ona dovodi do srca krv sa ugljen-dioksidom iz gornjih delova tela (glave, vrata, gornjih ekstremiteta i nekih organa grudne duplje). Srce potom tu krv malim krvotokom \u0161alje u plu\u0107a gde se krv oboga\u0107uje kiseonikom, kako bi kao takva bila poslata u organe \u0161irom na\u0161eg organizma.<\/p>\n<p>&nbsp;<\/p>\n<p>Gornja \u0161uplja vena je duga oko 7 cm dok joj pre\u010dnik iznosi oko 22 mm.<\/p>\n<h2><\/h2>\n<h2>Koja je uloga vena i venskog sistema?<\/h2>\n<p>Kao deo sistemske cirkulacije, venski sistem je odgovoran za prenos venske krvi od mi\u0161i\u0107a i tkiva do srca. Sa\u010dinjen je iz tri vrste vena (povr\u0161inskih, dubokih i komunikativnih &#8211; vezivnih vena). Povr\u0161inske vene u na\u0161em telu sme\u0161tene su u masnom potko\u017enom tkivu; duboke vene, sme\u0161tene su u mi\u0161i\u0107ima du\u017e kostiju , dok kratke vene (nazivaju se jo\u0161 vezivne vene) spajaju povr\u0161inske i duboke vene.<\/p>\n","protected":false},"author":11,"featured_media":0,"template":"","wiki-categories":[1666],"wiki-types":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.7.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Vene i venski sistem - Humanitas.net<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.humanitas.net\/sr\/wiki\/anatomija\/vene-venski-sistem\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Vene i venski sistem - Humanitas.net\" \/>\n<meta property=\"og:description\" content=\"\u0160ta predstavljaju vene i venski sistem? 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