Video: Lub peev xwm zoo sib npaug txhais li cas?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov zoo thiab tsis zoo Cov paib sawv cev rau DIRECTION ntawm daim nyias nyias peev xwm . Vim tias sodium gradient yog coj mus rau hauv lub cell, nws equilibrium muaj peev xwm yuav tsum yog POSITIVE kom tsav sodium OUT. Potassium muaj qhov REVERSE concentration gradient, yog li ntawd NEGATIVE equilibrium muaj peev xwm.
Ib yam li ntawd, nws raug nug, qhov muaj peev xwm sib npaug txhais 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.
Ib sab saum toj no, qhov zoo nernst muaj peev xwm txhais tau li cas? (Lub Nernst muaj peev xwm yog qhov voltage qho yuav sib npaug tawm qhov tsis sib npaug ntawm qhov sib npaug ntawm daim nyias nyias rau qhov ion. Piv txwv li, a zoo voltage (+55) nyob rau hauv lub neuron yuav khaws lub siab concentration ntawm zoo Na + ions sab nraum lub cell.
Qhov thib ob, qhov zoo ntawm daim nyias nyias txhais li cas?
Yog tias membrane muaj peev xwm ua ntau zoo tshaj nws yog nyob rau so peev xwm , cov daim nyias nyias hais tias yuav depolarized. Yog tias membrane muaj peev xwm ua tsis zoo ntau dua li nws nyob ntawm so peev xwm , cov daim nyias nyias hais tias yog hyperpolarized.
Vim li cas sodium thiaj muaj qhov zoo sib npaug?
Sodium thiab calcium ions zoo ENa txhais tau hais tias txhawm rau sib npaug ntawm sab hauv cov tshuaj gradient rau Na+, lub cell sab hauv yuav tsum yog +52 mV los tiv thaiv Na+ los ntawm diffusing mus rau hauv lub cell. Yog li ntawd, thaum so peev xwm nyob deb ntawm ENa, lub ncov ntawm qhov kev txiav txim peev xwm mus kom ze ENa.
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
Puas yog txhua qhov sib npaug sib npaug sib npaug?
Thawj qhov sib npaug sib npaug yog qhov tseeb yog tias nws muaj kev txuag kom muaj nuj nqis. Piv txwv li, qhov sib npaug sib cais yeej ib txwm muaj tseeb, txij li lub ntsiab lus lawv yog ntawm daim ntawv: M(y) + N(t) = 0, yog li ϕ(t, y) = A(y) + B(t) yog a khaws cia kom muaj nuj nqis
Puas muaj peev xwm hluav taws xob thiab lub zog muaj peev xwm tib yam Vim li cas lossis vim li cas ho tsis?
Lub zog muaj peev xwm hluav taws xob Ue yog lub zog muaj peev xwm khaws cia thaum cov nqi tawm ntawm qhov sib npaug (xws li lub zog muaj peev xwm gravitational). Lub peev xwm hluav taws xob zoo ib yam, tab sis ib tus nqi, Ueq. Ib qho hluav taws xob muaj peev xwm sib txawv ntawm ob lub ntsiab lus hu ua voltage, V = Ue2q−Ue1q
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
Puas muaj peev xwm equilibrium zoo ib yam li so muaj peev xwm?
Qhov sib txawv ntawm daim nyias nyias muaj peev xwm thiab qhov muaj peev xwm sib npaug (-142 mV) sawv cev rau lub zog hluav taws xob hluav taws xob uas tsav Na + mus rau hauv lub xovtooj ntawm lub peev xwm so membrane. Thaum so, txawm li cas los xij, qhov permeability ntawm daim nyias nyias mus rau Na + tsawg heev kom tsuas yog me me Na + xau rau hauv lub cell