Puas Planaria nthuav tawm cephalization?

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Puas Planaria nthuav tawm cephalization?
Puas Planaria nthuav tawm cephalization?
Anonim

Planarian yog tus tsiaj yooj yim tshaj plaws uas muaj lub cev npaj ntawm bilateral symmetry thiab cephalization . Lub hlwb ntawm cov dawb-nyob flatworms flatworms Cov helminths yog invertebrates characterized by elongated, ca los yog round lub cev. Nyob rau hauv kev kho mob schemes cov flatworms los yog platyhelminths (platy los ntawm Greek lub hauv paus ntsiab lus "flat") muaj xws li flukes thiab tapeworms. Roundworms yog nematodes (nemato los ntawm Greek hauv paus ntsiab lus "xov"). https://www.ncbi.nlm.nih.gov › books › NBK8282

Helminths: Qauv, Kev faib tawm, Kev Loj Hlob, thiab Kev Txhim Kho - NCBI

yog ib lub qauv bilobed nrog lub cortex ntawm paj hlwb thiab cov tub ntxhais ntawm cov hlab ntsha fibers nrog rau qee qhov uas txiav txim siab los tsim cov commissures.

Cephalization hauv planaria yog dab tsi?

Cov tswvcuab ntawm Phylum Platyhelminthes (tshwj xeeb yog qhov tseeb ntawm cov planarians, Chav Turbellaria) yog koom nrog lub hlwb thiab lub siab lub cev ntawm tus tsiaj pem hauv ntej. Qhov no hu ua cephalization. Nyob rau hauv cov tsiaj nrog cephalization, lub siab lub ntsws los ntawm ib puag ncig ua ntej.

Pob cov kab mob plab puas muaj cephalization?

Flatworms (phylum Platyhelminthes) yog cov tsiaj qub tshaj plaws nrog ob sab symmetry. Lawv kuj muaj qib siab tshaj plaws ntawm cephalization, nrog rau lub cev paub (photosensory thiab chemosensory cells) thiab lub paj hlwb concentrated ntawm qhov kawg.

Puas Planaria nthuav tawm kev nyob ib puag ncig?

Yog tias muaj kev ntxhov siab txaus tom qab noj mov, planaria yuav tshem tawm cov zaub mov uas tau noj yav dhau los ua kom muaj kev khiav tawm ntau dua. Latency rau noj nce nyob rau hauv lub xub ntiag ntawm tshiab stimuli, feem ntau yuav tsum tau ib tug sijhawm nyob ua ntejnoj mov (Zoo tshaj & Rubinstein, 1962).

Pob lub cev planarian nthuav tawm hom symmetry?

Ua ntej, cov neeg npaj muaj ob sab symmetrynrog ob lub paj uas nthuav dav lub cev ntev, qhov loj "hlwb" (ganglion cell), thiab ob lub qhov muag.

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