Cov txheej txheem:
- Qhov peev xwm hauv zos tshwm sim nyob qhov twg?
- axon muaj peev xwm tshwm sim nyob qhov twg?
- feem ntau cov peev txheej ua tau tshwm sim nyob qhov twg?
- Yuav ua li cas thiaj muaj peev xwm xaus lus nug?
Video: Qhov twg hauv zos muaj peev xwm tsim nyob rau hauv cov neuron?
2024 Tus sau: Fiona Howard | [email protected]. Kawg hloov kho: 2024-01-10 06:38
Thaum nws yog hom postsynaptic, lub peev xwm hauv zos feem ntau pib hauv cov dendrites thiab kis mus rau soma thiab axon. Nws yog nyob rau ntawm thawj ntu ntawm axon qhov twg, yog tias lub peev xwm hauv zos yog ntawm qhov pib amplitude, lub paj hlwb impulse yog generated.
Qhov peev xwm hauv zos tshwm sim nyob qhov twg?
Ua ntej, qhov muaj peev xwm hauv zos tshwm sim ntawm dendrites thiab soma ntawm neuronwhereas kev ua haujlwm muaj peev xwm tshwm sim ntawm axon hillock (los yog ib feem ntawm axon ze rau soma). Kev muaj peev xwm hauv zos tshwm sim los ntawm qhov kev txhawb nqa thaum muaj peev xwm ua tau tshwm sim los ntawm qhov muaj peev xwm hauv zos.
axon muaj peev xwm tshwm sim nyob qhov twg?
Ib qho muaj peev xwm ua tau tshwm sim thaum neuron xa cov ntaub ntawv hauv axon, deb ntawm lub cev ntawm tes. Neuroscientists siv lwm lo lus, xws li ib tug "spike" los yog "impulse" rau lub peev xwm ua. Lub peev xwm ua tau yog qhov tawg ntawm hluav taws xob ua haujlwm uas yog tsim los ntawm qhov tsis muaj zog tam sim no.
feem ntau cov peev txheej ua tau tshwm sim nyob qhov twg?
Txoj kev muaj peev xwm tuaj yeem tshwm sim tsis yog ntawm lub axon hillock, tab sis kuj nyob rau hauv axon thawj ntu, 30-40 μm los ntawm soma thiab ze rau thawj ntu ntawm myelinated. Hauv qee cov neurons qhov kev ua haujlwm muaj peev xwm txawm tshwm sim ntawm thawj qhov ntawm Ranvier, qhov twg sodium channels yog cov concentrated (Daim duab 1).
Yuav ua li cas thiaj muaj peev xwm xaus lus nug?
1) Qhov kev ua tau muaj peev xwm ncav cuag kawg ntawm ib qho axon, lub pob qhov rooj sib txuas. 2) Depolarization ntawm presynaptic membrane qhib voltage-gated calcium channel.
Pom zoo:
Thaum qhov xwm txheej wavelength yog lambda txwv tsis pub muaj peev xwm?
Thaum qhov xwm txheej wavelength yog lamda, nres muaj peev xwm yog 3V_0 . Kev sib raug zoo ntawm kev txwv tsis pub muaj peev xwm thiab wavelength yog dab tsi? Given: Stopping potential=V s =2 V , wavelength of events light=λ=2000 Å=2000 x 10 - 10 m, ceev lub teeb=c=3 x 10 8 m/s, Planck's tas li=h=6.
Nyob hauv kev muaj peev xwm lossis muaj peev xwm?
Tsis muaj lo lus hability. Muaj peev xwm muaj kev paub, kev txawj ua ib yam dab tsi. Lo lus ze tshaj plaws rau kev noj qab haus huv yuav yog qhov qub, tab sis ib txwm peb tsuas yog hais tias nws nyob tau lossis nyob tsis tau. Feem ntau yog xa mus rau ib puag ncig lossis tsev .
Cov kab mob twg muaj peev xwm ua rau cov hematopoiesis extramedullary?
Lub siab thiab spleen yog qhov chaw tseem ceeb ntawm extramedullary hematopoiesis. Lwm yam kabmob xws li lub ntsws, lub raum, thiab cov kab noj hniav tuaj yeem dhau los ua qhov chaw ntawm hematopoiesis thaum nyob rau hauv cov kab mob . Dab tsi yog extramedullary hematopoiesis thiab nws tshwm sim qhov twg?
Rau qhov xwm txheej ua rau tus neeg ua haujlwm tsis muaj peev xwm tshaj xya hnub?
Ntau tshaj xya-hnub tsis muaj peev xwm ntawm tus neeg ua haujlwm Cov xwm txheej yuav tsum tau tshaj tawm qhov uas lawv ua rau tus neeg ua haujlwm lossis tus neeg ua haujlwm tus kheej nyob deb ntawm kev ua haujlwm, lossis tsis tuaj yeem ua lawv txoj haujlwm ib txwm ua, ntau tshaj xya lub sijhawmhnub vim lawv raug mob.
Nyob rau hauv qhov xwm txheej twg nws raug cai rau tus menyuam yaus muaj cawv?
Ib tug me nyuam muaj peev xwm muaj thiab haus cawv thaum nyob rau hauv qhov pom pom ntawm lawv niam lawv txiv, tus saib xyuas raug cai, lossis tus txij nkawm . Yuav ua li cas thiaj yuav raug cai muag ib qho lus nug me me? Nyob rau hauv qhov xwm txheej twg nws raug cai rau tus menyuam yaus muaj cawv?
