Hom ntawm tiaj cua nab, tshwj xeeb tshaj yog lub sab nraud thiab sab hauv qauv

Hom Flatworms muaj uas tsis yog-cab thiab cab cov ntaub ntawv. Nyob rau hauv no dawb-nyob kab ke hauv ib chav kawm ntawv, thiab cov neeg uas nyob hauv cov nuj nqis ntawm lwm yam kab mob, - rau. Class cov neeg sawv cev Ciliated (Planaria turbellarians) nyob rau hauv lub cev ntawm cov dej, feem ntau yog npua.

Cab flatworms nyob rau hauv lub cev ntawm cov tsiaj thiab tib neeg. cov ntaub ntawv kab mob yog zoo yoog mus rau cov tej yam kev mob ntawm lub neej, uas yog. rau. muaj ib tug sucker, uas yog txuas mus rau cov phab ntsa hauv lub hauv nruab nrog cev ntawm tus tswv tsev, thiab ib tug segmented lub cev nrog ib tug puas tau-ua tus naj npawb ntawm theem. Lawv tsiag ntawv los ntawm qhov uas tsis muaj lub digestive system (tshwj tsis yog rau cov hoob kawm Flukes), as-ham yog absorbed los ntawm lub cev los ntawm tshwj xeeb outgrowths; co pa (lawv ua pa nyob rau hauv ib tug ntau heev oxygen-free ib puag ncig), thiab loj hlob (lawv yog hermaphrodites).

Tag nrho cov nta pub no kab khom mus tas li nyob rau hauv tus tswv tsev lub cev thiab yuav nyob rau hauv nws them tus nqi. Cov helminths muaj xws li: daim siab fluke, remenets, miv fluke, nqaij npuas tapeworm, Echinococcus, thiab lwm yam kom ntes lawv tus txiv neej ua tau, yog tias noj nyoos los yog tsis zoo kho nyuj nqaij, nqaij npuas thiab ntses ..

Hom Flatworms combines cov kab mob uas muaj xws li cov nta, ob sab nraud thiab sab hauv kev teeb tsa. Lawv sawv cev rau bespolostnoy tsiaj muaj ib tug elongated, flattened lub cev downwards, piv txwv li. E. Nws muaj ib tug ca los yog ntau heev tiaj tus. Tsis tas li ntawd, nws yog lawv thawj lub sij hawm muaj ob sab sib dho symmetry nyob rau hauv ontogeny nteg peb kab khaubncaws sab nraud povtseg - ecto, meso thiab endoderm - uas nrog cov kabmob uas yuav tsim nyob rau hauv lub neej yav tom ntej. Hom Flatworms kuj characterizes lub xub ntiag ntawm daim tawv nqaij-nqaij hnab uas yog ib qho ua ib pawg ntawm epithelium thiab pov tseg hauv qab cov nqaij fibers. Qhov no tso cai rau lawv mus rau "cab zoo li" txav.

Lub digestive system yog nyob rau hauv free daim ntawv yog txheej thaum ub cov qauv thiab muaj ib tug foregut, los yog lub caj pas, midgut, uas xaus blindly. Nyob rau hauv helminths no hloov khoom nruab nrog system yog txo.

Lub paj hlwb flatworms sawv cev paired cerebral ganglia thiab paj trunks, uas ncaim ntawm nws thiab cob cog rua ntawm annular choj. Txaus tsim yog ob longitudinal mob plab lub cev.

Plawv thiab ua pa tshuab yog tsis tam sim no. Ua pa cov neeg sawv cev ntawm cov chav kawm ntawv ciliated epithelium, uas them lawv lub cev los ntawm cov sab nraum.

Excretory kabmob - protonephridia. Lawv muaj xws li ib tug tubular system, uas xaus stellate hlwb nrog cilia. Feem ntawm metabolic cov khoom pov tseg rau hauv lub cheeb tsam no tshwm sim los ntawm tshwj xeeb excretory qhib.

Me nyuam system hermaphrodite thiab yog feem ntau ib tug system ntawm ducts, uas yog tsim nyog rau cov tshem tawm ntawm kev sib deev cov khoom, thiab copulatory hloov khoom nruab nrog rau sab hauv fertilization.

Yog li, lub hom pav ca cua nab - qhov no yog cia li cab ntaub ntawv (helminths), uas twb tau mus hloov thiab kho mus rau lawv txoj kev ntawm lub neej.