Video: Lub peev xwm ntawm cov poov tshuaj sib npaug yog dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov Potassium equilibrium muaj peev xwm EK yog −84 mV 5 mM poov tshuaj sab nraud thiab 140 mM sab hauv. Ntawm qhov tod tes, sodium equilibrium muaj peev xwm , ENa, yog kwv yees li +66 mV nrog kwv yees li 12 mM sodium sab hauv thiab 140 mM sab nraud.
Ntxiv rau qhov no, qhov sib npaug ntawm qhov muaj peev xwm txhais tau li cas?
Equilibrium (los yog thim rov qab) muaj peev xwm Rau txhua ion, lub kev sib npaug (los yog thim rov qab) muaj peev xwm yog daim nyias nyias peev xwm qhov twg cov net ntws los ntawm txhua qhov qhib channel yog 0. Hauv lwm lo lus, ntawm Erev, tshuaj thiab hluav taws xob yog hauv kev sib npaug.
Tom qab ntawd, lo lus nug yog, puas muaj peev xwm so zoo ib yam li qhov muaj peev xwm sib npaug? Cov so peev xwm Feem ntau yog txiav txim siab los ntawm qhov ntau ntawm cov ions hauv cov kua dej ntawm ob sab ntawm cov cell membrane thiab cov ion thauj cov proteins uas nyob hauv cov cell membrane. Hauv qhov no, lub so peev xwm ntawm no cell yuav yog ib yam raws li cov equilibrium muaj peev xwm rau poov tshuaj.
Ntawm no, vim li cas qhov sib npaug ntawm cov poov tshuaj tsis zoo?
nce daim nyias nyias peev xwm (hyperpolarize lub cell) vim muaj qhov ntxiv poov tshuaj sab nraud ntawm tes yuav ua rau lub Potassium equilibrium muaj peev xwm ntau tsis zoo . c. nce daim nyias nyias peev xwm vim tias qhov zoo tshaj plaws rau sab nraud ntawm tes ua rau sab hauv kuj ntau dua tsis zoo.
Lub peev xwm sib npaug rau calcium yog dab tsi?
Yog li ntawd, Ca++ diffuses mus rau hauv lub cell los ntawm calcium cov channel. Thov lub Nernst kev sib npaug rau sab nraud thiab sab hauv calcium Cov concentrations ntawm 2.5 mM thiab 0.0001 mM, feem, ua rau ib qho equilibrium muaj peev xwm ntawm +134 mV raws li qhia hauv qab no.
Pom zoo:
Yuav daws qhov tsis sib npaug ntawm cov kab sib npaug thiab cov kab sib npaug sib npaug li cas?
Kev daws qhov tsis sib npaug ntawm qhov sib npaug yog zoo ib yam li kev daws cov kab sib npaug. Qhov sib txawv tseem ceeb yog koj tig lub cim tsis sib xws thaum faib lossis muab faib los ntawm tus lej tsis zoo. Graphing linear inequalities muaj ob peb qhov sib txawv ntxiv. Qhov uas yog qhov ntxoov ntxoo muaj xws li qhov tseem ceeb uas qhov kev tsis sib xws ntawm cov kab tawm muaj tseeb
Yog vim li cas sodium poov tshuaj twj tso kua mis suav hais tias yog ib qho kev thauj mus los uas cov kev taw qhia yog cov sodium thiab poov tshuaj tau pumped?
Sodium-Potassium Pump. Kev thauj mus los yog lub zog xav tau cov txheej txheem ntawm kev siv cov molecules thiab ions hla daim nyias nyias 'nce toj' - tiv thaiv kev sib tw gradient. Txhawm rau txav cov molecules tawm tsam lawv cov concentration gradient, yuav tsum muaj cov khoom siv protein
Dab tsi yog qhov sib npaug rau tam sim no muaj peev xwm sib txawv thiab tsis kam?
Equations Equation Symbols Meaning in words I = Δ V R I = dfrac{Delta V}{R} I = RΔV I Kuv yog tam sim no, Δ V Delta V Δ V yog hluav taws xob muaj peev xwm sib txawv, thiab R yog tsis kam Tam sim no ncaj qha proportional rau hluav taws xob muaj peev xwm sib txawv thiab inversely proportional rau kuj
Dab tsi yog qhov txawv ntawm electrostatic muaj peev xwm thiab electrostatic muaj peev xwm zog?
Tsis muaj qhov sib txawv ntawm electrostatic potentialenergy thiab hluav taws xob (al) muaj peev xwm zog. Lub peev xwm hluav taws xob ntawm ib qho taw tes yog kev ua haujlwm los ntawm lwm qhov kev quab yuam hauv kev txav chav tsev zoo los ntawm ib qho arbitrarilychosen xoom ntawm lub peev xwm (feem ntau infinity) mus rau lub ntsiab lus
Dab tsi yog qhov sib txawv ntawm cov kab lus sib npaug thiab qhov sib npaug sib npaug?
Cov kab lus sib npaug muaj qhov muaj txiaj ntsig zoo ib yam tab sis tau nthuav tawm nyob rau hauv ib hom ntawv sib txawv uas siv cov khoom ntawm cov lej xws li ax + bx = (a + b) x yog cov kab lus sib npaug. nruj me ntsis, lawv tsis yog 'sib npaug', yog li peb yuav tsum siv 3 kab sib luag hauv 'sib npaug' es tsis yog 2 raws li qhia ntawm no