Cov peev txheej tau qhab nia yog cov kev hloov pauv hauv cov peev txheej membrane uas sib txawv ntawm qhov loj me, tsis yog tag nrho-lossis - tsis muaj.
Puas yog qhov muaj peev xwm muab qhab nia suav tias yog tag nrho lossis tsis muaj lus nug?
subthreshold tshwm sim; Cov kev hloov pauv hauv daim nyias nyias muaj peev xwm sib txawv ntawm qhov loj me, uas tsis yog tag nrho-lossis- tsis muaj. Qhov loj ntawm qhov muaj peev xwm muab qhab nia yog txiav txim siab los ntawm lub zog thiab zaus ntawm qhov stimulus. …
Puas yog qhov kev txiav txim muaj peev xwm suav tias yog tag nrho lossis tsis muaj?
Qhov peev xwm ua tau raug suav tias yog " tag nrho-lossis tsis muaj dab tsi" xwm txheej, nyob rau hauv qhov ntawd, thaum lub sijhawm muaj peev xwm mus txog, cov neuron ib txwm depolarizes. Thaum depolarization tiav lawm, lub xovtooj ntawm tes yuav tsum tam sim no "rov pib dua" nws cov membrane voltage rov qab mus rau qhov chaw so.
Vim li cas kev nqis tes ua txhua yam lossis tsis muaj?
Qhov peev xwm ua tau hais tias yog tag nrho-lossis-tsis muaj dab tsi vim nws tsuas yog tshwm sim rau qhov loj txaus depolarizing stimuli, thiab vim tias nws daim ntawv muaj kev ywj pheej loj ntawm kev txhawb nqa rau suprathreshold stimuli. Hauv qee cov neurons, ib qho kev ua haujlwm muaj peev xwm tuaj yeem raug cuam tshuam los ntawm kev txhawb nqa hyperpolarizing (Fig.
Qhov muaj peev xwm muab qhab nia hauv cov neuron yog dab tsi?
Graded peev xwm yog kev hloov pauv ib ntus hauv daim nyias nyias voltage, tus yam ntxwv ntawm qhov nyob ntawm qhov loj ntawm qhov kev txhawb nqa. Qee hom stimuli ua rau depolarization ntawm daim nyias nyias, hos lwm tus ua rau hyperpolarization. Nws nyob ntawm qhov tshwj xeeb ion channel uas tau qhib rau hauv cell membrane.
