Yuav ua li cas yog ib tug Hydra? Coelenterates Class of hydroid

Los ntawm no tsab xov xwm koj yuav kawm dab tsi rau ib tug Hydra. Qhov no sawv cev ntawm coelenterates yus muaj los ntawm ntau qho tseem ceeb heev dab nyob rau hauv kev sib piv nrog rau cov thawj multicellular kab mob - lub paj rwb. Yuav ua li cas yog cov peculiarities ntawm kev teeb tsa yog vim li cas? Cia saib ua ke.

Yuav ua li cas yog lub Hydra nyob rau hauv Mythology

Cov hom twg thiaj li raug nws lub npe vim hais tias ntawm qhov sib thooj nrog lub mythological hero - Lernaean Hydra. Raws li cov lus dab neeg, nws yog ib tug nab-zoo li dab nrog lom ua tsis taus pa. Hydra lub cev muaj ob peb taub hau. Swb nws yuav tsis muaj leej twg - nyob rau hauv qhov chaw ntawm lub taub hau felled tam sim ntawd loj hlob ib tug ob peb sawv daws yuav tshiab.

Nyob Lernaean Hydra nyob rau hauv lub pas dej Lerna, uas guarded nkag mus rau lub ntiajteb sab hauv ntawm Hades. Tsuas yog Hercules twb tau mus txiav tawm ntawm nws immortal lub taub hau. Tom qab nws faus nws nyob rau hauv lub hauv av thiab muab ib tug hnyav pob zeb. Qhov no yog tus thib ob ua hauj lwm rau ntawm Hercules ntawm lub kaum ob.

Hydra: Biology

High muaj peev xwm rov qab poob qhov chaw ntawm lub cev los yog lwm cov yam ntxwv yog thiab rau dej tsis qab ntsev Hydra. Qhov no tsiaj yog tus neeg sawv cev ntawm lub hom coelenterates. Yog li ntawd yog dab tsi yog ib tug Hydra? Qhov no ib dej tsis qab ntsev polyp, uas yog heev dua lwm yam txuas txoj kev ua neej.

General yam ntxwv ntawm coelenterates

Zoo li tag nrho cov coelenterate, Hydra yog ib tug dej lub neej. Nws prefers ntiav puddle, pas dej los yog dej nrog ib tug me me tam sim no, uas tso cai rau lawv yuav tsum tau txuas mus rau cov nroj tsuag, los yog nyob ze-hauv qab cov khoom.

Cov chav kawm yog hais Hydroids coelenterates, jellyfish thiab coral polyps. Rau tag nrho lawv cov neeg sawv cev yog yus muaj los ntawm radial los yog radial symmetry. Qhov no yam ntxwv feature txuam nrog ib tug sedentary txoj kev ua neej. Nyob rau hauv lub center ntawm tus tsiaj lub cev muaj peev xwm muab ib tug xav txog tej yam taw tes uas tag nrho cov sab los tuav lub rays.

Tag nrho coelenterates yog multicellular tsiaj, tab sis lawv tsis tsim ntaub so ntswg. Lawv lub cev yog sawv cev los ntawm ob khaubncaws sab nraud povtseg ntawm tshwj xeeb hlwb. Nyob rau hauv lub plab hnyuv lumen, nyob rau hauv uas lub plab zom mov ntawm cov zaub mov. Kawm txawv ntawm coelenterates txoj kev sib txawv ntawm lub neej:

• Hydroids txuas mus rau lub substrate los ntawm txoj kev tib tug thiab yog ib.
• Coral polyps kuj tsau, tab sis daim ntawv zos nyob rau hauv cov pua pua txhiab tus neeg.
• Jellyfish nquag ua luam dej nyob rau hauv cov dej kem. Nyob rau tib lub sij hawm lawv txo lub tswb thiab cov dej yog thawb nrog quab yuam. Qhov no suab yog hu ua reactive.

lub cev qauv

Lub cev ntawm dej tsis qab ntsev Hydra zoo li soj caum. Nws lub hauv paus yog hu ua tus tib tug. Nrog nws tshwm sim tsiaj txuas rau underwater khoom. Thaum lub opposite kawg ntawm lub cev yog lub qhov ncauj qhib ib puag ncig los ntawm tentacles. Nws ua rau yus mus rau hauv lub plab hnyuv lumen.

Hydra lub cev phab ntsa muaj ob khaubncaws sab nraud povtseg ntawm lub hlwb. Lub sab nraum no yog hu ua cov ectoderm. Nws yog li ntawm daim tawv nqaij thiab nqaij, paj, intermediate thiab stinging hlwb. Lub puab txheej, los yog endoderm tsim ntawm lwm yam - digestive thiab glandular. Nruab nrab ntawm lub khaubncaws sab nraud povtseg ntawm lub cev yog ib tug txheej ntawm extracellular matrix uas muaj ib tug phaj daim ntawv.

Cell hom thiab cov txheej txheem ntawm lub neej

Txij li thaum lub cev ntawm lub Hydra yog tsis tsim tej ntaub so ntswg los yog kabmob, tag nrho cov physiological dab yog nqa tawm nrog kev pab los ntawm tshwj xeeb hlwb. Yog li, epithelial-npag muab lub zog. Yog, nyob rau hauv kev phem ntawm lub taag txoj kev ntawm lub neej hydroid tau tsiv mus. Nyob rau hauv no ua ntej txo epithelial-mob hlwb ntawm ib sab ntawm lub cev, tus tsiaj yog "qaij de", sawv nyob rau hauv tentacles thiab ces nws txo qis mus rau lub ib. Xws li ib tug tsab ntawv tsa suab yog hu ua kev taug kev.

Ntawm epithelial-npag paj hlwb yog lub hnub qub-puab. Nrog lawv pab tus tsiaj perceive stimuli los ntawm ib puag ncig thiab nyob rau hauv ib txoj kev lub luag hauj lwm rau lawv. Piv txwv li, yog tias qhov kov Hydra koob, nws shrinks.

Ectoderm muaj thiab intermediate hlwb. Lawv muaj peev xwm ntawm tsab transformations. Yog hais tias tsim nyog, lawv tsim hlwb ntawm txhua yam. Nws yog lawv uas yog lub luag hauj lwm rau cov theem siab ntawm rov qab los ntawm cov tsiaj. Nws yog lub npe hu hais tias Hydra yuav kiag li rov qab nws ib feem ntawm 1/200 los yog slurry zoo li lub xeev.

Los ntawm intermediate hlwb tsim thiab pw ua ke. Qhov no muaj tshwm sim nrog qhov pib ntawm lub caij nplooj zeeg. Nyob rau hauv cov ntaub ntawv no, lub qe thiab cov phev fuse tsim tau ib zygote, thiab cov niam kab mob tuag. Nyob rau hauv lub caij nplooj ntoos hlav ntawm lawv tsim hluas cov neeg. Lub caij ntuj sov Hydra reproduces los ntawm budding - tsim ib tug me me hillock, uas tsub kom nyob rau hauv loj, kis tau cov yam ntxwv ntawm ib tug neeg laus kab on nws lub cev. Nrog rau txoj kev loj hlob nws phua tawm thiab pauv mus rau ywj siab hav zoov.

Lub endoderm coelenterates nyob digestive hlwb. Nyob rau hauv lawv muaj ib tug splitting ntawm cov as-ham. Ib tug caj pas hlwb paim enzymes nyob rau hauv lub plab hnyuv lumen, ua cov zaub mov ntog mus rau hauv daim. Yog li, rau ib tug raug ob hom Hydra digestion. Lawv hu ua intracellular thiab zais zis.

stinging hlwb

Nws yog tsis yooj yim sua rau teb cov lus nug, yog dab tsi yog ib tug Hydra, yog hais tias tsis muaj cuab kav nrog peculiarities ntawm stinging hlwb. Nyob rau hauv cov xwm, lawv yog pom xwb nyob rau hauv coelenterates tsiaj. Nrog lawv muaj kev tiv thaiv, kev puas tsuaj thiab ntau lawm tuav. Yog li ntawd, lawv loj npaum li cas yog muab pov tseg rau hauv lub tentacles.

Ntxais ntxais cell muaj ib tug capsule nrog ib tug helically cov xov. Nyob rau saum npoo ntawm cov qauv no yog rhiab cov plaub hau. Nws yog nws mob prey swims los ntawm. Raws li ib tug tshwm sim, cov xov no yog unwound thiab nrog lub dag lub zog ntawm kev khawb rau hauv tus neeg lub cev, paralyzing nws.

Los ntawm hom ntawm coelenterates lub hwj chim, Hydra nyob rau hauv particular yog heterotrophic ua npua. Lawv pub on me me dej invertebrates. Piv txwv li, daphnia, cyclops, oligochaetes, rotifers, dev mub, yoov tshaj cum kab thiab ntses Fry.

Lub ntsiab lus coelenterates

Tus nqi ntawm lub Hydra nyob rau hauv cov xwm feem ntau yog lus dag nyob rau hauv lub fact tias nws ua raws li ib tug lom lim thas. Nws lim cov dej los ntawm tshem tawm hais, uas noj thiab haus. Qhov no yog ib qho tseem ceeb link hwj chim circuits dej tsis qab ntsev. Hydro pub ib co cladocerans, turbellarians thiab ntses loj tshaj 4 cm. Mal'kov Hydra nws tus kheej muaj feem xyuam rau cov venom ntawm stinging hlwb.

Tab sis zaum ntawm cov nqe lus nug, yog dab tsi lub Hydra tej zaum teb hais tias nws yog ib tug paub yam khoom ntawm laboratory kev ntsuam xyuas. Cov nta coelenterates txoj kev tshawb no lwm dab, physiology qis multicellular, budding.

Yog li, lub dej tsis qab ntsev Hydra yog tus neeg sawv cev ntawm ib tug hauv chav kawm ntawv hom Hydroids Coelenterates. Qhov no ob-txheej multicellular tsiaj nrog radial symmetry, uas nws lub cev yog ua los ntawm ntau hom ntawm tshwj xeeb hlwb.