Lapho coelenterates ekugayeni ukudla: ikakhulukazi zomzimba

Amachibi Hydra, jellyfish futhi kwamakhorali - ifanela coelenterates izilwane ezinamangqamuzana amaningi. Hlobo luni lwendlela yokuphila musa bemqhuba? Ukuphakelwa? Lapho coelenterates ekugayeni ukudla? Izimpendulo zale mibuzo neminye eminingi kungatholakala esihlokweni sethu.

izici Jikelele coelenterates

Naphezu kweqiniso lokuthi bakuphi ezinamangqamuzana amaningi, coelenterates kungekho kwezicubu. Ngakho, akukho bona eziyishumi nemitshingo. Coelenterates litshwayo kuba phambi namangqamuzana akhethekile yakha umzimba ezimbili ungqimba. Ngaphandle ubizwa ngokuthi yi-ectoderm. It yakhiwa Lesisemkhatsini, kabuhlungu, isikhumba, imisipha, ubulili kanye ezinzwa.

Endoderm - elingaphakathi ungqimba coelenterates umzimba. Lena ingxenye yomzimba lapho coelenterates ekugayeni ukudla. Cabangela izici bokuphila loluhlelo isibonelo angenasawoti Hydra.

ukugaya cavitary

Hydra ayikwazi ukuhamba asebenzayo. Umsebenzi we uhlobo sucker abasenzela yedwa, ngakolunye uhlangothi okuyinto umlomo. Lizungezwe ihambe. Lapho coelenterates ekugayeni ukudla? Le nqubo iqala ingaphakathi lomzimba.

Hydra kuthinta ezinamagobolondo futhi izinhlanzi izibungu usebenzisa amaseli kabuhlungu. Ngaphezu kwalokho feelers isizinda ihamba ngomlomo phakathi komgodi umzimba. amaseli yezindlala ayingxenye endodermal, angawodwa mfihlo ekhethekile, lapho amakhefu ukudla zibe yizicucu ngabanye.

ukugaya yeselula

Isakhiwo olandelayo, lapho ukudla kugaywe coelenterates namangqamuzana wokugaya ukudla. Sinenkosi flagella, okuyinto ukudala samanje amanzi. Nalokhu ukudla izinhlayiya alethwe ebusweni cell. Kuzoba esigabeni esilandelayo cleavage wakhe.

amaseli wokugaya ukudla futhi babe unyawo zamanga. Lokhu edlulayo amaqhubu cytoplasm. Bathatha ukudla, futhi kuba ngaphakathi engqamuzaneni. Lapho, vacuoles wokugaya ukudla kwenzeka yokugcina cleavage inqubo. izinsalela Undigested futhi ababonakali ngezikhundla ngomlomo.

Ngakho, thina esiphethweni lapho coelenterates ekugayeni ukudla. Le nqubo ithatha indawo ngezigaba ezimbili. Zonke coelenterates kukhona eziyingozi. Nge bona thwebula amaseli inyamazane kabuhlungu. Tentacles azungeze umlomo, ihambise ku mafutha anciphisa isikhala esingaphakathi emathunjini. Kube iqala esigabeni sokuqala ukugaya, okuyinto lufinyelela umvuthwandaba walo e ezikhethekile endoderm amaseli.