Nws tuaj yeem pom nyob rau hauv daim ntawv ntawm cov ceg ntoo uas muaj siliceous spicules tau kos. Hauv Keratosa, spicules tsis muaj kiag li thiab spongin ib leeg yog tsim.
Cov spicules twg muaj nyob hauv sycon?
Lub cev ntawm sycon daim txhuam cev yog tsim los ntawm txheej dermal txheej thiab sab hauv gastral txheej Nyob rau hauv nruab nrab ntawm ob txheej mesenchyme yog tam sim no. Qhov no mesenchyme muaj amoebocytes. Lub scleroblasts secrete spicules uas los ntawm lub cev pob txha ntawm lub cev sycon. Cov spicules no yog tsim los ntawm cov khoom calcareous.
3 hom spicules hauv porifera yog dab tsi?
Raws li tus naj npawb ntawm cov axis tam sim no nyob rau hauv cov rays spicules yuav muaj peb hom: monoaxon, triaxon thiab polyaxon. Monaxon: Cov spicules no loj hlob raws ib qho axis. Cov no tej zaum yuav ncaj koob zoo li tus pas nrig-zoo li los yog tej zaum yuav nkhaus. Lawv qhov kawg tej zaum yuav taw tes, pob qhov rooj los yog hooked.
hom spicules muaj nyob hauv chav kawm calcarea?
Cov calcareous sponges ntawm chav kawm Calcarea yog cov tswv cuab ntawm cov tsiaj phylum Porifera, cellular sponges. Lawv yog cov yam ntxwv los ntawm spicules ua tawm ntawm calcium carbonate nyob rau hauv daim ntawv ntawm calcite los yog aragonite. Thaum cov spicules hauv ntau hom muaj peb lub ntsiab lus, hauv qee hom lawv muaj ob lossis plaub lub ntsiab lus.
Dab tsi yog spicules lossis spongin Fibres?
Cov pob txha pob txha ntawm daim txhuam cevyog spicules thiab spongin fibers. Spicules yog tsim los ntawm carbonates ntawm txiv qaub los yog silica nyob rau hauv daim ntawv ntawm koobzoo li daim. Spongin fibers yog tsim los ntawm silk-zoo li scleroprotein.
