Qhov sib txawv tseem ceeb ntawm daim nyias nyias muaj peev xwm thiab qhov muaj peev xwm sib npaug yog qhov muaj peev xwm membrane yog qhov hluav taws xob muaj peev xwm sib txawv ntawm sab nraud thiab sab hauv cov plasma membrane ntawm lub xovtooj thaum muaj peev xwm sib npaug yog lub peev xwm membrane yuav tsum tsim hluav taws xob sib npaug.
Cov tshuaj sib txawv, tshwj xeeb tshaj yog ions thiab cov as-ham, nkag mus rau hauv thiab tawm ntawm lub cell ntawm lub cell membrane. Txhawm rau noj ions thiab cov as-ham hauv lub cell, cov hlwb tsim thiab tswj kom muaj lub peev xwm ntawm daim nyias nyias ntawm cov plasma membrane. Lub peev xwm membrane yog qhov sib txawv ntawm qhov hluav taws xob lossis hluav taws xob muaj peev xwm ntawm sab hauv thiab sab nraud ntawm tes. Nws ua haujlwm raws li lub zog los pab txhawb kev txav ntawm ions passively hauv ib qho kev coj. Txawm li cas los xij, qhov sib npaug ntawm qhov muaj peev xwm txwv tsis pub cov ion txav mus rau hauv daim nyias nyias. Nws yog lub peev xwm ntawm daim nyias nyias uas cov net ntws yog xoom hla ntawm daim nyias nyias. Yog li ntawd, ntawm qhov muaj peev xwm sib npaug, ions tsis txav mus rau hauv lossis tawm ntawm lub cell.
Membrane Potential yog dab tsi?
Feem ntau, muaj qhov sib txawv lossis qhov sib txawv ntawm qhov sib txawv ntawm sab hauv thiab sab nraud ntawm tes. Tshwj xeeb, muaj qhov tsis zoo voltage hauv lub xov tooj ntawm tes thaum muaj qhov zoo voltage sab nraud ntawm tes. Yog li, lub peev xwm membrane yog qhov sib txawv ntawm cov cell membrane. Qhov no tshwm sim vim kev sib cais ntawm qhov zoo thiab qhov tsis zoo ions hla ntawm daim nyias nyias. Qhov tseeb, lub peev xwm ntawm daim nyias nyias yog lub zog uas pab txhawb kev txav mus los ntawm ions hauv ib qho kev coj. Nyob rau hauv qhov chaw so, qhov sib txawv ntawm qhov hluav taws xob no hu ua lub peev xwm so membrane. Thaum stimulation, cov nqi thoob plaws hauv daim nyias nyias hloov thiab tsim kom muaj peev xwm ua tau.
Daim duab 01: Membrane Potential
Muaj ntau yam uas txiav txim siab lub peev xwm membrane. Lawv yog ion concentrations sab hauv thiab sab nraud ntawm tes, permeability ntawm cell membrane rau ions thiab kev ua ntawm ion channels xws li Na+/K+ -ATPase thiab Ca++ thauj twj nyob rau hauv lub cell membrane.
Yuav Ua Li Cas Muaj Peev Xwm Zoo yog dab tsi?
Equilibrium peev xwm ntawm ib qho ion yog lub peev xwm ntawm daim nyias nyias uas sib npaug ntawm cov concentration gradient ntawm cov ion hla daim nyias nyias. Nyob rau hauv lwm yam lus, equilibrium muaj peev xwm yog lub peev xwm membrane uas yuav tsum tau los tsim electrochemical equilibrium. Ntawm qhov muaj peev xwm sib npaug, cov dej ntws ntawm qhov tshwj xeeb ion hla ntawm daim nyias nyias yog xoom. Thaum xav txog K+ ion, qhov sib npaug ntawm K+ yog tus nqi tsis zoo hla daim nyias nyias uas yuav tsum tawm tsam kev txav ntawm K + nqes nws cov concentration gradient.
Nyob hauv cov hlwb glial, lub peev xwm so ntawm daim nyias nyias yog sib npaug rau qhov sib npaug rau K+ ion. Ntxiv mus, nyob rau hauv cov neurons, lub so ntawm daim nyias nyias muaj peev xwm nyob ze heev rau lub equilibrium muaj peev xwm ntawm K+..
Dab tsi zoo sib xws ntawm Membrane Potential thiab Equilibrium Potential?
- Net electrochemical quab yuam yog qhov sib txawv ntawm daim nyias nyias muaj peev xwm thiab qhov muaj peev xwm sib npaug.
- Lub peev xwm membrane uas yuav tsum tau tsim hluav taws xob sib npaug yog qhov muaj peev xwm sib npaug.
Qhov txawv ntawm Membrane Potential thiab Equilibrium Potential yog dab tsi?
Lub peev xwm membrane yog qhov sib txawv ntawm tag nrho cov nqi ntawm sab hauv thiab sab nrauv ntawm tes. Nyob rau hauv sib piv, equilibrium muaj peev xwm yog lub membrane muaj peev xwm uas raws nraim qhov sib npaug ntawm cov concentration gradient ntawm ib qho ion thoob plaws hauv daim nyias nyias. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm daim nyias nyias muaj peev xwm thiab muaj peev xwm sib npaug.
Ntxiv mus, daim nyias nyias muaj peev xwm ua kom muaj zog ion txav mus rau hauv ib qho kev taw qhia, thaum lub peev xwm sib npaug txwv tsis pub cov ion txav mus thoob lub membrane.
Hauv qab no yog cov ntsiab lus ntawm qhov sib txawv ntawm daim nyias nyias thiab qhov muaj peev xwm sib npaug.
Summary – Membrane Potential vs Equilibrium Potential
Lub peev xwm ntawm daim nyias nyias yog qhov sib txawv ntawm cov hluav taws xob muaj peev xwm ntawm sab hauv thiab sab nrauv ntawm cov kab mob lom. Ntawm qhov tod tes, qhov muaj peev xwm sib npaug yog lub peev xwm ntawm daim nyias nyias uas yuav tsum tau tsim cov khoom siv hluav taws xob sib npaug. Thaum muaj peev xwm sib npaug, cov net ion ntws dhau los ua xoom. Yog li ntawd, tsis muaj qhov ntws ntawm qhov tshwj xeeb ion ntawm ib sab ntawm daim nyias nyias mus rau lwm qhov. Yog li, qhov no qhia txog qhov sib txawv ntawm daim nyias nyias thiab muaj peev xwm sib npaug.
