![Puas placoderms puas muaj pob txha? Puas placoderms puas muaj pob txha?](https://i.tvmoviesgames.com/preview/questions/17887177-did-placoderms-have-bones-j.webp)
2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Placoderms yog thawj lub puab tsaig ntses; lawv lub puab tsaig yuav hloov zuj zus los ntawm thawj zaug ntawm lawv cov gill arches. … Lub puab tsaig nyob rau hauv lwm cov placoderms tau yooj yim thiab muaj ib leeg pob txha. Placoderms kuj yog thawj cov ntses los tsim pelvic fins, lub precursor rau hindlimbs hauv tetrapods, nrog rau cov hniav tseeb.
Puas yog ntses ntses evolve los ntawm placoderms?
Bony ntses, chav kawm Osteichthyes, yog tus cwj pwm los ntawm cov pob txha pob txha es tsis yog pob txha mos. Lawv tshwm sim hauv Silurian lig, txog 419 lab xyoo dhau los. Qhov kev tshawb pom tsis ntev los no ntawm Entelognathus tau pom zoo tias cov ntses pob txha (thiab tej zaum cov ntses cartilaginous, ntawm acanthodians) tau hloov zuj zus los ntawm early placoderms.
Puas placoderms muaj hniav?
Cov kev tshuaj ntsuam tshiab qhia tias placoderms, uas nyob ntawm kwv yees li 420 lab xyoo dhau los mus txog 360 lab xyoo dhau los, muaj cov hniav tseeb nrog cov hniav thiab cov kab noj hniav, cov kws tshawb fawb qhia hauv online hnub no hauv Nature.
Placoderms zoo li cas?
Feem ntau cov placoderms yog me me lossis nruab nrab ntawm qhov loj, tab sis qee qhov yuav tau mus txog qhov ntev ntawm 13 feet (4 meters). Lub npe yog muab los ntawm lawv cov yam ntxwv armor ntawm dermal, los yog tawv nqaij, pob txha. Cov cuab yeej no ua rau lub taub hau thiab lub cev tiv thaiv lub cev, ob qho tib si sib txuas los ntawm kev sib koom ua ke hauv cheeb tsam caj dab.
Puas yog tib neeg placoderms?
Cov placoderms yog ib pawg neeg sib txawv ntawm cov ntses armored thaum ub thiab nws tau ntseeg davhais tias lawv yog poj koob yawm txwv rau tag nrho cov vertebrates ciaj sia niaj hnub no, suav nrog tib neeg.
Pom zoo:
Dab tsi ua kom pob txha pob txha ntawm cov pob qij txha?
![Dab tsi ua kom pob txha pob txha ntawm cov pob qij txha? Dab tsi ua kom pob txha pob txha ntawm cov pob qij txha?](https://i.tvmoviesgames.com/preview/questions/17862965-what-smoothens-bone-surfaces-at-joints-j.webp)
pob txha muab cov duab, txhawb nqa, thiab qauv rau lwm cov ntaub so ntswg hauv lub cev. Nws kuj yuav pab tau cov pob qij txha. Pob txha mos kuj smoothens cov pob txha nto ntawm cov pob qij txha. Cov ntaub so ntswg dab tsi npog cov pob txha ntawm cov pob qij txha?
Puas yog pob txha pob txha pob txha zoo ib yam li meniscus?
![Puas yog pob txha pob txha pob txha zoo ib yam li meniscus? Puas yog pob txha pob txha pob txha zoo ib yam li meniscus?](https://i.tvmoviesgames.com/preview/questions/17870516-is-articular-cartilage-the-same-as-meniscus-j.webp)
Cov pob txha mos yog qhov tawv tab sis du npog ntawm qhov kawg ntawm cov pob txha hauv cov pob qij txha. Nws tso cai rau gliding yam tsis muaj kev tiv thaiv ntau thiab ua haujlwm nrog cov meniscus kom cushion kawg ntawm cov pob txha. Lub meniscus nyob nruab nrab ntawm lub femur thiab tibia.
Dab tsi qhov sib txawv ntawm cov pob txha pob txha thiab pob txha?
![Dab tsi qhov sib txawv ntawm cov pob txha pob txha thiab pob txha? Dab tsi qhov sib txawv ntawm cov pob txha pob txha thiab pob txha?](https://i.tvmoviesgames.com/preview/questions/17891970-whats-the-difference-between-compact-and-spongy-bone-j.webp)
Cov pob txha pob txha yog tsim los ntawm osteons thiab tsim cov txheej txheem sab nraud ntawm txhua pob txha. Cov pob txha pob txha yog tsim los ntawm trabeculae thiab ua rau sab hauv ntawm txhua pob txha. Dab tsi yog qhov sib txawv ntawm cov pob txha pob txha thiab pob txha pob txha?
Puas yog pob txha pob txha pob txha?
![Puas yog pob txha pob txha pob txha? Puas yog pob txha pob txha pob txha?](https://i.tvmoviesgames.com/preview/questions/17914850-are-shin-bones-bumpy-j.webp)
Muaj kev ntxhov siab raug muab tso rau ntawm pob txha shin, uas yog tibia. Yog tias koj muaj shin splints thiab koj khiav koj cov ntiv tes raws tibia, koj yuav hnov ntau pob. Cov no muaj rau ib qho laj thawj. Koj tuaj yeem muaj ko taw tiaj tus lossis cov arches siab uas cuam tshuam rau lub ntsej muag, koj tuaj yeem muaj lub duav tsis muaj zog uas cuam tshuam rau lub shins.
Puas yog lub pob txha pob txha pob txha pob txha?
![Puas yog lub pob txha pob txha pob txha pob txha? Puas yog lub pob txha pob txha pob txha pob txha?](https://i.tvmoviesgames.com/preview/questions/17917992-is-an-endplate-fracture-a-compression-fracture-j.webp)
CONCLUSIONS: vertebral endplate raug mob feem ntau pom hauv osteoporotic vertebral compression fractures. Dab tsi ua rau lub pob txha tawg? Nws yog kev xav tias, nyob rau hauv ntau qhov mob ntawm qhov mob qis qis, thawj qhov ua rau mob yog pob txha ntawm pob txha caj qaum los ntawm compression rog.