natalni i postnatalni period razvića životinja
TRANSCRIPT
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Referat iz biologijeTema: Natalni i postnatalni
periodrazvića životinja
Učenik: ... III2g Profesor: ...
Decembar, 2016
JU CSŠ “Petar Kočić” Srbac
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Primjeri nekih trudnih životinja
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Razvojkonja
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Natalni period razvića
• Rođenje• Oviparnost, ovoviviparnost i viviparnost• Omogućavanje efikasnog transporta kroz
placentijalnu barijeru • Tri tipa placente • Adecidualna i decidualna placenta
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Pupčana vrpca: • Posrednik između fetusa i placente• Obično sadrži dvije arterije i jednu venu
novorođeni slon novorođena ajkula
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Postnatalni period razvića
• Obuhvata metabolno i ametabolno razviće, rast i remodeliranje, metamorfozu i regeneraciju
• Ametabolno (bez metamorfoze) • Metabolno (hemimetabolno – nepotpuna,
homometabolno – potpuna metamorfoza)• Insekti
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Rast, remodeliranje i metamorfoza
• Završetak embrionalnog razvoja• Metamorfoza (potpuna i nepotpuna)• Potpuna metamorfoza – 4 stadijuma: jaje,
larva, lutka i odrasla jedinka• Nepotpuna metamorfoza – 3 stadijuma: jaje,
nimfa, odrasla jedinka
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Primjer potpune metamorfoze kod leptira
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Primjer nepotpune metamorfoze kod krpelja
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Metamorfoza i životni ciklus kod vodozemaca (primjer žabe)
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Regeneracija
• Proces obnavljanja dijela ili cijelog tijela• Dva vida regeneracije• Primjer morske zvijezde
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Ekstremni vid regeneracije: aksolotl
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HVALA NA PAŽNJI!