Lub peev xwm ntawm cov poov tshuaj sib npaug yog dab tsi?
Lub peev xwm ntawm cov poov tshuaj sib npaug yog dab tsi?

Video: Lub peev xwm ntawm cov poov tshuaj sib npaug yog dab tsi?

Video: Lub peev xwm ntawm cov poov tshuaj sib npaug yog dab tsi?
Video: Tshuaj theem vim li cas thiaj tau nqi ?/ Siv kho mob dab tsi?/paris polyphylla use for? 2024, Kaum ib hlis
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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.

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