Resting membrane peev xwm ntawm ib tug neuron yog txog -70mV uas txhais tau hais tias sab hauv ntawm cov neuron yog 70mV tsawg dua sab nraud. Muaj ntau k thiab tsawg NA+ sab hauv thiab ntau NA+ thiab tsawg K+ sab nraud.
Dab tsi yog qhov neuron so membrane muaj peev xwm?
Ib tug neuron thaum so yog qhov tsis zoo: sab hauv ntawm lub xovtooj yog kwv yees li 70 millivolts ntau duatsis zoo dua sab nraud (−70 mV, nco ntsoov tias tus lej no txawv ntawm hom neuron thiab los ntawm hom).
Yuav ua li cas rau qhov so ntawm daim nyias nyias thaum lub sij hawm depolarization?
Hyperpolarization thiab depolarization
Hyperpolarization yog thaum daim nyias nyias muaj peev xwm ua qhov tsis zoo ntawm qhov chaw tshwj xeeb ntawm cov paj hlwb, thaum depolarization yog thaum lub peev xwm ntawm daim nyias nyias yuav tsis zoo (ntau qhov zoo).
Yuav ua li cas thaum lub sij hawm repolarization?
Repolarization yog ib theem ntawm qhov kev ua tau zoo uas cell ntsib qhov txo qis ntawm qhov hluav taws xob vim yog cov dej ntawm cov poov tshuaj (K+) ions raws nws electrochemical gradient theem no tshwm sim tom qab lub xovtooj mus txog nws qhov siab tshaj plaws voltage los ntawm depolarization.
Lub hom phiaj ntawm kev rov ua dua yog dab tsi?
Tus nqi overshoot ntawm lub xov tooj muaj peev xwm qhib qhov hluav taws xob-gated potassium raws, uas ua rau muaj cov poov tshuaj loj loj, txo cov cell electropositivity. Lub sijhawm no yog theem repolarization, uas nws lub hom phiaj yog txhawm rau rov qab kho cov membrane so.
