Depolarization ntawm cardiac myocytes ua rau contraction ntawm cov hlwb thiab yog li lub plawv contraction tshwm sim. Depolarization thawj zaug pib hauv SA node, uas tseem hu ua cardiac pacemaker.
Yuav ua li cas ua rau muaj kev sib kis?
1. A Cov leeg nqaij yog tshwm sim thaum muaj peev xwm ua tau taug kev raws cov hlab ntsha mus rau Cov leeg. Cov leeg nqaij pib thaum lub paj hlwb tsim cov teeb liab. Lub teeb liab, ib qho impulse hu ua qhov muaj peev xwm ua tau, mus los ntawm ib hom paj hlwb hu ua lub cev muaj zog neuron.
Yuav ua li cas thaum lub sijhawm depolarization?
Lub depolarization, tseem hu ua theem nce, yog tshwm sim thaum zoo them sodium ions (Na+) dheev maj nrawm los ntawm qhib qhov hluav taws xob-gated sodium channel rau hauv neuron. Raws li ntxiv sodium rushes nyob rau hauv, lub membrane muaj peev xwm thim rov qab nws polarity.
Dab tsi yog qhov txawv ntawm depolarization thiab repolarization?
Kev txav ntawm lub cell daim nyias nyias mus rau qhov zoo dua yog hu ua depolarization. Lub hloov pauv hauv daim nyias nyias los ntawm qhov zoo mus rau qhov tsis zooyog hu ua repolarization.
plaub kauj ruam ntawm kev nqis tes ua yog dab tsi?
Ib qho peev xwm ua tau tshwm sim los ntawm qhov pib lossis suprathreshold stimuli rau ntawm neuron. Nws muaj plaub theem: depolarization, overshoot, thiab repolarization.
