pljosnati crvi; planarije
TRANSCRIPT
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PLJOSNATI CRVIDamnjanović Ivana
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Opšte odlike
Žive u slanim, slatkim vodama i na vlažnom zemljištuBrojne parazitske vrste
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Aktivno se kreću
Fosili nisu nađeni zbog nedostatka skeletnih elemenata
Do sada je opisano oko 20 000 vrsta
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Pljosnato teloDvobočna simetrija-telo se uzdužnom ravni deli na levu i desnu polovinu
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Prednji deo tela(glaveni region)
Zadnji deo tela
GRAĐA TELA
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Troslojne životinje:-spoljašnji sloj (kožno-mišićni; sadrži
žlezdane ćelije)-unutrašnji sloj-središnji sloj-parenhim (transport hranljivih
i štetnih materija)
Spoljašnjisloj
Središnji sloj
Unutrašnjisloj
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PLJOSNATI CRVI
Trepljasti crvi(planarije)
Metilji
Pantljičare
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Žive u slanim, slatkim vodama (čistim!) i na vlažnom zemljištu
PLANARIJE (TREPLJASTI CRVI)
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Malih su dimenzija, veličine od nekoliko milimetara do nekoliko desetina centimetara (60 cm), koje dostižu neke tropske vrsteObično su jarkih boja, slatkovodne vrste su uglavnom beličaste ili prozračne
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Na telu se razlikuje glaveni regionNa njemu se nalaze oči i dva izraštaja oblika pipka na kojima su čulne ćelije
Oči
Izraštaji
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Telo je sluzavoNa površini tela se nalaze treplje (kretanje)
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Grabljivice
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KarnivoriHrane se sitnim račićima i drugim beskičmenjacimaManji broj vrsta se hrani algama
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Ishrana
Izbacuju ždrelo kroz usni otvorNa ždrelo se nastavlja razgranato crevo
u kojem se hrana variNesvarenu hranu izbacuju kroz usni otvor
Crevo
Ždrelo
Usni otvor
Hrana
Nesvareniostaci hrane
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Razgranato crevo
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Vrsta koja se hrani plaštašima
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Dišu površinom telaIzlučuju preko posebnog sistema za izlučivanje (ekskreciju)-prvi put u evoluciji!
Ekskretorni kanali
Ekskretorne pore
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Vrpčast nervni sistem
Nervne ganglije
Nervne vrpce
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RazmnožavanjeBespolno
Polno
Poprečna deoba Hermafroditi Unakrsno oplođenje
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Regeneracija
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Izvesni eksperimenti su pokazali da jedna vrsta trepljastih crva planarija ne samo što je u stanju da regeneriše glavu kada joj je neko odseče već regenerisani “mozak” uspeva da sačuva sva sećanjaNaučnici su u laboratoriji ispitivali pamćenje trepljastih crva mereći koliko im dugo treba da dođu do hraneIpak, potrebno je još istraživanja da se otkrije gde skladište memoriju i kako su u stanju da regenerišu ceo mozakNaučnici se nadaju da bi to istraživanje pomoglo da se obnove sećanja i ljudi
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HVALA NA PAŽNJI!!!