Qhov Tseem Ceeb Qhov txawv - Depolarization vs Repolarization
Peb lub hlwb txuas nrog rau lwm yam kabmob thiab cov leeg hauv peb lub cev. Thaum peb txhais tes txav mus, lub hlwb xa cov cim los ntawm cov paj hlwb mus rau cov leeg hauv tes kom cog lus. Cov paj hlwb xa ntau cov hluav taws xob impulses qhia cov leeg hauv tes kom cog lus. Cov hluav taws xob impulses nyob rau hauv paj hlwb yog lub npe hu ua kev muaj peev xwm. Qhov kev txiav txim muaj peev xwm tshwm sim los ntawm qhov concentration gradient ntawm ions (Na+, K+ lossis Cl–). Peb qhov xwm txheej tseem ceeb tshwm sim hauv qhov muaj peev xwm ua tau yog: depolarization, repolarization thiab hyperpolarization. Hauv depolarization, Na+ ions rooj vag qhib. Nws coj inflow ntawm Na+ ions mus rau hauv lub cell thiab li no, cov neuron cell yog depolarized. Lub peev xwm ua tau dhau los ntawm axons. Nyob rau hauv repolarization, cell rov qab los so membrane muaj peev xwm dua los ntawm kev tso tseg ntawm Na+ ions. Lub K+ ions tau ntws tawm ntawm cov xov tooj ntawm tes hauv repolarization. Thaum muaj peev xwm ua tau dhau los ntawm K+ gated channels ntev dhau lawm, cov neuron looses ntau K+ ions. Qhov no txhais tau hais tias cov cell neuron tau txais hyperpolarized (ntau qhov tsis zoo dua li so lub peev xwm membrane). Qhov sib txawv tseem ceeb ntawm depolarization thiab repolarization yog tias, depolarization ua rau muaj peev xwm ua tau vim Na+ ions mus rau hauv cov axon membrane los ntawm Na+ / K. + twj thaum nyob rau hauv repolarization, K+ tawm mus rau axon membrane los ntawm Na+/K + lub twj tso kua mis ua rau lub cell rov qab los so kom muaj peev xwm.
Dab tsi yog Depolarization?
Depolarization yog txheej txheem tshwm sim uas tshwm sim hauv cov cell neuron uas hloov cov polarization ntawm nws. Lub teeb liab yog los ntawm lwm lub hlwb uas txuas nrog cov neuron. Qhov zoo them Na+ ions ntws mus rau hauv lub cev ntawm tes los ntawm "m" voltage gated channels. Cov tshuaj tshwj xeeb hu ua neurotransmitters yog khi rau cov ion channel uas ua rau lawv qhib rau lub sijhawm. Cov khoom Na+ ions coj cov membrane muaj peev xwm los ze rau "zero". Qhov ntawd tau piav qhia tias yog depolarization ntawm neuron cell.
Yog tias lub cev ntawm tes tau txais kev txhawb nqa uas dhau qhov pib muaj peev xwm nws tuaj yeem ua rau Sodium raws hauv axon. Tom qab ntawd, lub peev xwm ua haujlwm lossis hluav taws xob impulses yuav raug xa mus. Qhov no cia tus nqi zoo Na+ ions ntws mus rau qhov tsis zoo them axons. Thiab nws depolarizes ib puag ncig axons. Ntawm no, thaum ib lub channel qhib thiab cia cov ions zoo nyob rau hauv, nws ua rau lwm cov channel ua tib yam hauv cov axons.
Daim duab 01: Depolarization
Raws li qhov ua tau muaj peev xwm dhau los ntawm kev sib tw neuron, nws dhau qhov sib npaug thiab ua rau muaj txiaj ntsig zoo sai. Thaum lub xovtooj tau txais txiaj ntsig zoo, cov txheej txheem depolarization tiav. Thaum cov neuron tau depolarized lub "h" voltage rooj vag raug kaw thiab thaiv cov Na+ ions nkag mus rau hauv lub cell. Qhov no pib cov kauj ruam tom ntej uas yog hu ua repolarization uas coj cov neuron rau nws lub peev xwm so.
Repolarization yog dab tsi?
Cov txheej txheem ntawm repolarization coj rov qab cov cell neuron rau daim nyias nyias so lub peev xwm. Cov txheej txheem inactivation ntawm sodium gated channels yuav ua rau lawv kaw. Nws nres qhov nrawm sab hauv ntawm qhov zoo Na+ ions mus rau hauv lub cell neuron. Tib lub sijhawm, cov kab hluav taws xob uas hu ua "n" channel tau qhib. Muaj ntau K+ ions concentration hauv cell dua li sab nraud ntawm tes. Yog li ntawd, thaum cov K+ channel raug qhib, ntau cov poov tshuaj ions ntws tawm ntawm daim nyias nyias dua li thaum lawv tuaj. Lub cell poob nws cov ions zoo. Yog li ntawd, lub cell rov qab mus rau lub sij hawm so. Tag nrho cov txheej txheem no tau piav qhia raws li repolarization.
Nyob rau hauv neuroscience nws txhais tau tias yog qhov kev hloov pauv hauv daim nyias nyias mus rau qhov tsis zoo dua tom qab lub depolarization theem ntawm kev ua tau zoo. Qhov no feem ntau yog hu ua lub caij poob ntawm qhov muaj peev xwm ua. Muaj ob peb lwm K+ channel uas pab txhawb rau cov txheej txheem repolarization xws li, A-hom channels, qeeb rectifiers thiab Ca2+ qhib K + channels.
Daim duab 02: Repolarization
Lub repolarization thaum kawg ua rau theem hyperpolarization. Hauv qhov no, lub peev xwm ntawm daim nyias nyias tau txais qhov tsis zoo tshaj li qhov muaj peev xwm so. Lub hyperpolarization feem ntau yog vim qhov efflux ntawm K+ ions los ntawm K+ channel lossis influx ntawm Cl– ions los ntawm Cl– channels.
Dab tsi yog qhov zoo sib xws ntawm Depolarization thiab Repolarization?
- Ob leeg yog theem ntawm kev ua tau zoo.
- Ob leeg tseem ceeb heev los tswj cov kab mob neuron muaj peev xwm.
- Ob leeg tau pib vim muaj kev sib xyaw ua ke ntawm ions hauv thiab tawm ntawm cov cell neuron (Na+, K+)
- Ob leeg tau pib vim qhov nkag thiab tawm ntawm cov ions los ntawm cov kab hluav taws xob gated hauv cov cell membrane.
Qhov txawv ntawm Depolarization thiab Repolarization yog dab tsi?
Depolarization vs Repolarization |
|
| Depolarization yog cov txheej txheem uas pib nkag ntawm Na+ ions rau hauv lub xovtooj thiab tsim muaj peev xwm ua haujlwm hauv cov cell neuron. | Repolarization yog cov txheej txheem uas rov qab cov cell neuron rau hauv nws lub peev xwm so tom qab depolarization los ntawm kev txwv tsis pub nkag ntawm Na+ ions mus rau hauv lub cell thiab xa ntau K + ions tawm ntawm lub hlwb neuron. |
| Ntse Charge | |
| Nyob rau hauv depolarization, neuron cell lub cev muaj tus nqi zoo. | Nyob rau hauv repolarization, lub cev neuron cell muaj tus nqi tsis zoo. |
| Inflow thiab tawm ntawm Ions | |
| Ntau qhov zoo them Na+ ions nkag mus rau cov cell neuron tshwm sim hauv depolarization. | Ntau qhov zoo them K+ ions outflow ntawm cov cell neuron tshwm sim hauv repolarization. |
| Hauv kev depolarization, Sodium "m" voltage gated channel yog siv. | Nyob rau hauv repolarization, Potassium "n" voltage gated channels thiab lwm yam poov tshuaj raws yog siv (A-hom raws, ncua rectifiers thiab Ca2+ qhib K + channels). |
| Neuron Cell Polarization | |
| Nyob rau hauv depolarization muaj tsawg polarity nyob rau hauv neuron cell. | Nyob rau hauv repolarization muaj ntau polarity nyob rau hauv neuron cell. |
| Txoj Kev Muaj Peev Xwm | |
| Nyob rau hauv depolarization so tej zaum yuav tsis tau rov qab. | Nyob rau hauv repolarization so muaj peev xwm rov qab los. |
| Mechanical Activity | |
| Depolarization ua rau muaj kev ua haujlwm. | Repolarization tsis ua rau muaj kev ua haujlwm. |
Summary – Depolarization vs Repolarization
Cov hluav taws xob impulses uas tau pib hauv cov paj hlwb paub tias muaj peev xwm ua tau. Qhov kev txiav txim muaj peev xwm tshwm sim raws li qhov concentration gradient ntawm ions (Na+, K+ lossis Cl–) hla lub axon membrane. Peb qhov xwm txheej tseem ceeb tshwm sim hauv qhov muaj peev xwm ua tau raug piav qhia xws li: depolarization, repolarization thiab hyperpolarization. Thaum lub sij hawm depolarization, muaj peev xwm ua tau yog tsim los ntawm kev nkag mus ntawm Na+ rau hauv axon ntawm sodium channels nyob rau hauv daim nyias nyias. Depolarization yog ua raws li repolarization. Repolarization txheej txheem coj cov depolarized axon membrane rau hauv nws lub peev xwm so los ntawm kev qhib cov poov tshuaj thiab xa K+ ions tawm ntawm axon membrane. Qhov no yog qhov txawv ntawm depolarization thiab repolarization.
Download PDF Version of Depolarization vs Repolarization
Koj tuaj yeem rub tawm PDF version ntawm kab lus no thiab siv nws rau offline lub hom phiaj raws li daim ntawv ceeb toom. Thov download PDF version ntawm no Qhov txawv Ntawm Depolarization thiab Repolarization
