KumiswaIsayensi

Yi-ectoderm - lokhu yangaphandle imbewu ungqimba

I yi-ectoderm kuyingxenye yimuphi umzimba isilwane ezinamangqamuzana amaningi. abanye kuphela kulesi sakhiwo inakekelwa ngesikhathi kuphela ukuthuthukiswa embryonic, kuyilapho abanye - for a lifetime. Kuyini yi-ectoderm?

Izinhlobo izingqimba zamagciwane

Phakathi ontogeny neqanda avundiswa uhlukanisa ngokuphindaphindiwe, ukwakha amangqamuzana amaningana ngokuhamba kwesikhathi. Phakathi kwamangqamuzana yabo kumiswa izingqimba eziningana emzimbeni, okuyinto kamuva uyomenzela ezicutshini, kwezitho izinhlelo. Yi-ectoderm - isiqeshana germinal yangaphandle. Phakathi ukuthuthukiswa kwe-zygote kwakheka it is a lokuqala olwelwesini amaseli. Iqabunga kwangaphakathi umbungu ebizwa ngokuthi endoderm. Kamuva zavela izinhlelo zokuphefumula futhi wokugaya ukudla. Kusukela maphakathi lwegciwane ungqimba - mesoderm - ezakhiwe emizimbeni abonakala ukuhlanganisa uxhumano nomsebenzisi ndawonye wonke umzimba. Kuyinto imisipha nemisipha, skeleton yangaphakathi, zokuzala, kwegazi futhi izinhlelo excretory.

nemikhiqizo ye yi-ectoderm

Yi-ectoderm - ungqimba nucleation, kwakhiwa lamaseli ihlanganisa futhi izitho ezithile zesimiso sezinzwa. Ukwakheka kwabo kwenzeka ngesikhathi isigaba gastrula. Isimiso sezinzwa yezilwane ezinomgogodla libhekene ezingeni lelisetulu ukuthuthukiswa. It siqukethe le asebuchosheni nomgogodla, kanye imicu ngabanye ukuthi ukhulise kusukela kubo bonke izakhiwo zomzimba. Sense Izinhlaka kanye inzwa izinhlelo nazo elisuselwa yi-ectoderm. Njengoba umbungu kusuka ucezu olwelwesini amaseli, it yakha umgubuzelo. Ngokuyinhloko kuyinto nezicubu EPITHELIAL kwesikhumba futhi isimiso sokugaya ukudla bungene.

yi-ectoderm of Hydra

Ngo coelenterates izilwane yi-ectoderm - ungqimba umzimba ukuthi iqhubeka kukho konke ukuphila. Cabanga ngesibonelo sika-isakhiwo angenasawoti yayo Hydra. Leli isilwane ezimbili ungqimba isidumbu by ecto- futhi endoderm. Phakathi kwabo kuyinto ipuleti obukhulu izidakamizwa intercellular. yi-ectoderm maseli kuhluka isakhiwo, nemisebenzi. Ngokokuqala ngqá e kwemvelo izakhiwo ezikhethekile ezifana avele nje abamele coelenterates.

Isakhiwo siqukethe ectodermal isikhumba-imisipha amaseli, ekwazi ukwenza inkontileka. Siyabonga kubo, i-Hydra ihamba njengengelosi acrobat ephendukela amathe phezu ihambe. Lapho wadalula ezinzwa, nayo ahlelwe olwelwesini umzimba, isilwane onomfutho. Lena ukubonakaliswa umsebenzi reflex. Olwelwesini nayo ngokufanele Lesisemkhatsini amaseli ukuthi kungenziwa siguqulelwa kwanoma yiziphi ezinye izinhlobo. Kuchaza ezingeni lelisetulu yokutakula angenasawoti Hydra. Kungaba ukubuyisela ngokuphelele emzimbeni wakho, ngisho besesimweni mushy.

Uyini amaseli esintinyelayo

Yi-ectoderm - kuyinto olwelwesini esebenza njengesikhali kwezindlela ezikahle Ukuvikelwa nokuzingela. Lomsebenzi wenziwa amaseli kabuhlungu. Zakhiwa capsule nge ngentambo ezisontekile ngaphakathi. Lapho isisulu odlula, yena oza izinwele ebucayi. Ngenxa yalokho, esintinyelayo ngentambo unwinds futhi aphendule ngomfutho eluma emzimbeni wakhe. Ndawonye nalo yethulwe ezinobuthi. isisulu Zingenamandla usebenzisa feelers ungaphakathi mafutha anciphisa isikhala esingaphakathi emathunjini, lapho ukugaya. Abaningi zama-jellyfish ziyingozi kubantu. Usebenza amaseli wabo esintinyelayo kubangela ukusha, ukuphazamiseka inhliziyo futhi umgudu wokuphefumula, futhi ngezinye izikhathi ngisho imikhawulo kanye nokufa.

Ngakho, le yi-ectoderm iyona yangaphandle izingqimba zamagciwane, kusukela lapho inqubo yokugaya e ezilwaneni ezinomgogodla ezinamehlo ezimise umzimba nesembozo futhi izitho ezithile zesimiso sezinzwa. Ngo coelenterates yi-ectoderm yakha inani lamaseli ezikhethekile: isikhumba, imisipha, Lesisemkhatsini, nerve futhi kabuhlungu.

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