Cov txheej txheem:
- Dab tsi yog qhov neuron so membrane muaj peev xwm?
- Yuav ua li cas rau qhov so ntawm daim nyias nyias thaum lub sij hawm depolarization?
- Yuav ua li cas thaum lub sij hawm repolarization?
- Lub hom phiaj ntawm kev rov ua dua yog dab tsi?
Video: Thaum lub sijhawm neuron so lub peev xwm?
2024 Tus sau: Fiona Howard | [email protected]. Kawg hloov kho: 2024-01-10 06:38
Resting membrane peev xwm ntawm ib tug neuron yog txog -70mV uas txhais tau hais tias sab hauv ntawm cov neuron yog 70mV tsawg dua sab nraud. Muaj ntau k thiab tsawg NA+ sab hauv thiab ntau NA+ thiab tsawg K+ sab nraud.
Dab tsi yog qhov neuron so membrane muaj peev xwm?
Ib tug neuron thaum so yog qhov tsis zoo: sab hauv ntawm lub xovtooj yog kwv yees li 70 millivolts ntau duatsis zoo dua sab nraud (−70 mV, nco ntsoov tias tus lej no txawv ntawm hom neuron thiab los ntawm hom).
Yuav ua li cas rau qhov so ntawm daim nyias nyias thaum lub sij hawm depolarization?
Hyperpolarization thiab depolarization
Hyperpolarization yog thaum daim nyias nyias muaj peev xwm ua qhov tsis zoo ntawm qhov chaw tshwj xeeb ntawm cov paj hlwb, thaum depolarization yog thaum lub peev xwm ntawm daim nyias nyias yuav tsis zoo (ntau qhov zoo).
Yuav ua li cas thaum lub sij hawm repolarization?
Repolarization yog ib theem ntawm qhov kev ua tau zoo uas cell ntsib qhov txo qis ntawm qhov hluav taws xob vim yog cov dej ntawm cov poov tshuaj (K+) ions raws nws electrochemical gradient theem no tshwm sim tom qab lub xovtooj mus txog nws qhov siab tshaj plaws voltage los ntawm depolarization.
Lub hom phiaj ntawm kev rov ua dua yog dab tsi?
Tus nqi overshoot ntawm lub xov tooj muaj peev xwm qhib qhov hluav taws xob-gated potassium raws, uas ua rau muaj cov poov tshuaj loj loj, txo cov cell electropositivity. Lub sijhawm no yog theem repolarization, uas nws lub hom phiaj yog txhawm rau rov qab kho cov membrane so.
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 .
Puas yog sijhawm sijhawm lossis sijhawm sijhawm?
Raws lub npe qhov txawv ntawm sijhawm sijhawm thiab sijhawm sijhawm yog qhov sijhawm sijhawm yog lub sijhawm ua raws sijhawm thaum sijhawm sijhawm yog sijhawm sijhawm; qhov tseeb . Puas yog lub sijhawm sijhawm ib lo lus? adj. 1. Ua los yog tuaj txog raws li lub sijhawm teem tseg;
Thaum lub sijhawm depolarization ntawm lub paj hlwb muaj peev xwm?
Lub depolarization, tseem hu ua theem nce, yog ua rau thaum muaj txiaj ntsig zoo sodium ions (Na +) dheev nrawm dhau los ntawm qhib qhov hluav taws xob-gated sodium channel rau hauv cov neuron. Raws li ntxiv sodium rushes nyob rau hauv, lub membrane muaj peev xwm thim rov qab nws polarity .
Lub sijhawm depolarization lub membrane muaj peev xwm voltage?
Lub peev xwm so yog lub xeev ntawm daim nyias nyias ntawm qhov hluav taws xob ntawm −70 mV, yog li cov sodium cation nkag mus rau ntawm tes yuav ua rau nws tsis zoo. Qhov no yog hu ua depolarization, txhais tau hais tias lub peev xwm membrane txav mus rau xoom .
