Fais fab flatworms. Cov pub flatworms?

Tag nrho cov neeg sawv cev ntawm multicellular tsiaj ntau theem ntawm lub koom haum, tus yam ntxwv nta ntawm lub neej dab thiab cov chav nyob rau hauv ib taxa - hom. Ib tug tag nrho ntawm 7 hom ntawm flatworms yog ib tug ntawm lawv. Cov creatures yog heev zoo yoog mus rau lub tej yam kev mob ntawm cov hav zoov thiab coj nws lom niche. Yuav ua li cas yog cov zaub mov flatworms? Cov lus teb tab tom nrhiav rau hauv peb tsab xov xwm.

General Cov yam ntxwv ntawm flatworms

Lub npe ntawm tus neeg sawv cev ntawm no taxonomic pab pawg neeg tau txais ua tsaug rau lub cev zoo. Tus ntoo khaub lig seem tsa flatworms ntawv los yog kab xev. Cov tsiaj no yog yus muaj los ntawm ob sab sib dho symmetry thiab zoo li tus hloov khoom nruab nrog nruab. Licas hais daim tawv nqaij-npag hnab txhuv, uas muaj ob peb nto epithelium thiab nqaij khaubncaws sab nraud povtseg. Lub excretory system muaj ib tug nyias tubular, outwardly qhib pores.

Feem coob ntawm cov tiaj tus cua nab - hermaphrodites, tab sis ib txhia yuav propagated thiab vegetatively. Nyob rau hauv cab hom kev hloov ntawm cov tswv muaj cai nyob rau hauv lub neej voj voog - kawg thiab intermediate. Lub paj hlwb muaj lub hauv paus thiab peripheral qhov chaw. Tab sis ua pa flatworms muaj thiab nqa tawm nkev pauv nyob tag nrho saum npoo ntawm lub cev.

vaj tse

Ntawm cov tsiaj nyob rau hauv ob qho tib si cab thiab dawb-nyob hom, uas txiav txim lub hwj chim ntawm flatworms. Lawv muaj peev xwm yuav nrhiav tau nyob rau hauv lub seas, dej tshiab, thiab heev tsis tshua muaj nyob rau hauv av nyob rau hauv teb chaws sov forests.

Cab hom nyob rau hauv cov hnyuv thiab siab ntawm muaj ntau yam tsiaj: nyuj, npua, dev, miv, thiab txawm phev whales. Ib txhia tej hom nyob rau hauv tib neeg lub cev.

Nta ntawm lub digestive system

Lub digestive system yog ib tug raug kaw hom flatworm. Nws muaj lub qhov ncauj thiab cov hnyuv. Yuav ua li cas yog cov zaub mov flatworms? Khoom noj khoom haus hais nkag mus rau ntawm lub qhov ncauj yog nqis nyob rau hauv cov hnyuv branched, thiab residues kuj muab tshem tawm los ntawm ib tug qhib nyob rau hauv lub hauv pem hauv ntej thaum xaus ntawm lub cev.

Fais fab flatworms uas yog cab txoj kev ntawm lub neej, yog vim lub party. Nyob rau hauv tej yam kiag li ploj lawm lub nruab nrog digestive system. Twb nqis tshuaj lawv nqus los ntawm lub npog.

Fais fab flatworms

Cua nab uas nyob rau hauv ntau cov dej lub cev, yog ua npua. Lawv tua tsiaj me me thiab hauv qab nrog ib tug tshwj xeeb proboscis nqus tawm lawv txheem.

Fais fab flatworms thiab roundworms yog sib txawv dog dig, vim hais tias cov tom kawg ntawm lub digestive system hom. Nws muaj hauv daim ntawv ntawm lub raj nrog lub qhov ncauj thiab qhov quav qhib, li ntawd, cov metabolism hauv lawv yog ntau khaus. Dawb-terrestrial flatworms pub rau kab kab uas nyob rau hauv lub ntub hav zoov pem teb.

turbellarians

Cov neeg sawv cev ntawm no hauv chav kawm ntawv ntawm cov tsiaj nyob rau hauv cov dej. Nyob rau hauv no ib puag ncig, lub epithelial hlwb paim ib tug tshwj xeeb daim card, uas yuav pab kom cov me me benthic cov tsiaj - crustaceans, hydro, ntau yam kab. Fais fab flatworms ntawm cov chav kawm ntawv yuav siv sij hawm qhov chaw yog heev txawv txawv.

Piv txwv li, ib tug ntais dawb planarians qhov ncauj qhib situated nyob rau hauv nruab nrab ntawm lub cev nyob rau hauv nws ventral sab. Cov cab creeps rau tus neeg, yog li kom nws. Ntxiv mus, los ntawm lub qhov ncauj proboscis protrudes los ntawm kev uas planaria nqus cov kua txheem ntawm lub extraction lub cev.

flukes

Cov pub flatworms uas yog cab? Xav txog lo lus nug no li ib qho piv txwv flukes chav kawm ntawv. Lub npe lawv tau txais ua tsaug rau cov suckers. Feem ntau, muaj ob: lub qhov ncauj thiab lub plab. Nrog lawv pab, cov cab txuas mus rau cov hauv nruab nrog cev ntawm tus tswv tsev.

Cov cua nab yog nyob rau hauv tus txheej txheem ntawm txoj kev loj hlob yog haum complex lub neej voj voog. Piv txwv li, qe siab fluke thawj nrog undigested zaub mov residue nyuj poob mus rau hauv cov dej, thiab ces - nyob rau hauv lub cev ntawm mollusks, qhov uas lawv tsim tailed maggots uas mus rau hauv dej dua. Hauv ntawm cov nroj tsuag, lawv tig mus rau hauv cov hlwv. Nyuj, uas yog lub tseem party cab kis tus kab mob thaum noj mov los yog haus dej nyom. Nyob rau hauv nws lub cev cyst pib loj hlob thiab tsim mus rau hauv ib tug neeg laus, qhov luaj li cas ntawm cov uas mus txog rau 3 cm.

Nws yog nyob rau ntawm no theem, cov cab zaub mov. Tom qab ntawm cov thawj sucker yog lub qhov ncauj uas opens mus rau hauv cov hnyuv. Lub digestive system muaj hauv daim ntawv ntawm ib lub hnab los yog ob tug raws, uas qhov muag tsis pom kawg. Txij li thaum muaj yog tsis muaj cov ntaub ntawv ntawm cua nab lub cev muaj kab noj hniav thiab cov ntshav system, mob huam, thiab kuj ua lub muaj nuj nqi ntawm muab tag nrho lub cev nrog rau ntau yam tshuaj. Flukes pub rau cov ntshav, hnoos qeev thiab epithelial hlwb. helminths metabolic khoom tso los ntawm lub qhov ncauj, yog li lom zaum kawg party kab mob.

tapeworms

Cov neeg sawv cev ntawm cov hoob kawm no yog yus muaj los ntawm tag nrho tsis tuaj kawm ntawv ntawm lub digestive system. Qhov no feature yog muaj feem xyuam rau lawv txoj kev ntawm lub neej. Ntawm lub taub hau ntawm tapeworms yog tshwj xeeb kabmob ntawm txuas. Lawv muaj peev xwm pab tau raws li xuas khob, hooks los yog proboscis. Nrog lawv pab, cov cab txuas mus rau ntawm cov phab ntsa hauv cov hnyuv. Twb yog cov nqis tshuaj lawv nqus tag nrho saum npoo ntawm lub cev, ces tus kabmob ntawm lub digestive system lawv yuav tsis tau.

Tapeworms yog ib tug loj txaus ntshai rau tus neeg uas yog rau lawv raws li intermediate thiab zaum kawg party. Absorbing ib tug loj tus naj npawb ntawm cov as-ham thiab vitamins, cov cab no yog loj hlob sai heev, tej zaum ncav gigantic proportions. Piv txwv li, bovine thiab porcine tapeworm loj hlob mus txog 10 meters. Noj tshuaj pab rau cov tib neeg, cov cab sai sai deplete nws lub cev. Nyob rau hauv cov ntaub ntawv no kuj muaj yog ib lom lub party cua nab khoom pauv. Ib tug neeg kis tau kab mob cua nab, muaj tsis muaj zog, kiv taub hau, xeev siab, anorexia, thiab txawm tsis nco qab.

Yog li ntawd, yog dab tsi noj flatworms, nyob ntawm lawv lub vaj tse thiab txoj kev ntawm lub neej. Cov tej yam kev mob txiav txim seb cov qauv thiab cov yam ntxwv ntawm lawv digestive system. Qhov no hom ntawm cov tsiaj combines 3 chav kawm: ciliary, tapeworms thiab flukes. Tus thawj yog cov dawb-nyob ua npua uas mus yos hav zoov nyob rau hauv lub reservoirs rau me tsiaj. Flukes - cab uas muab lawv tus kheej mus rau lub hauv nruab nrog cev thiab cov nqaij mos thiab pub khoom. Tapeworms tsis muaj digestive system. Cov cab nyob hauv lub lumen ntawm cov tsiaj thiab tib neeg me me hnyuv, pub rau twb nqis zaub mov hais.