Tus yam ntxwv ntawm txoj kev them nyiaj no yog tias nws tau them nrog lub siab tam sim no. Thaum nws raug them rau qee qhov hluav taws xob (sib npaug rau qhov hluav taws xob ntawm qhov hluav taws xob ntawm lub roj teeb), nws nres them thiab tawm nrog lub siab tam sim no (lossis qis tam sim no) kom depolarize, thiab tom qab ntawd nws raug them nrog lub siab tam sim no. Raws li qhov no, cov txheej txheem them nqi thiab kev tso tawm yog nqa tawm ua ke. Qhov zaus ntawm cov mem tes tawm mus nce nrog qhov nce ntawm lub zog them, thiab qhov dav ntawm kev them nyiaj mem tes txo qis nrog qhov nce ntawm lub zog them. Thaum tus nqi them thiab qhov tso tawm yog qhov sib npaug, nws txhais tau hais tias lub roj teeb tau them tag nrho, thiab qhov kev them nyiaj tiav tam sim ntawd.
Raws li txoj kev no, muaj ntau lub tswv yim hauv tsev thiab txawv teb chaws kom paub txog kev them nyiaj sai ntawm cov roj teeb. Txoj kev no tsis muaj kev ntsuas depolarization ntawm thawj theem ntawm kev them nyiaj. Tom qab ntxiv kev ntsuas depolarization, qhov dav them mem tes txuas ntxiv txo qis, uas ua rau tus nqi nruab nrab ntawm kev them nqi tam sim no poob sai dua thiab ua rau lub sijhawm them nyiaj ntev dua.
