Tsis zoo li qhov muaj peev xwm ua tau zoo, qhov kev tshaj tawm ntawm qhov kev ua haujlwm muaj peev xwm yog unidirectional, vim lub sijhawm refractory kiag li nyob rau hauv physiology, lub sij hawm refractory yog lub sij hawm ntawm lub sij hawm thaum lub sij hawm uas lub cev los yog cell tsis muaj peev xwm. ntawm kev rov ua ib qho kev ua tshwj xeeb, lossis (ntau dua) lub sijhawm nws yuav siv sijhawm rau ib qho excitable membrane kom npaj rau qhov kev txhawb nqa thib ob thaum nws rov qab mus rau nws lub xeev so tom qab kev zoo siab. https://en.wikipedia.org › Refractory_period_(physiology)
Lub sijhawm Refractory (physiology) - Wikipedia
tiv thaiv kev pib ntawm AP hauv thaj tsam ntawm daim nyias nyias uas nyuam qhuav tsim AP.
Vim li cas qhov kev nqis tes ua tsuas yog taug kev hauv ib qho kev taw qhia?
Cov sodium channels hauv cov kab mob neuronal tau qhib rau hauv cov lus teb rau me me depolarization ntawm daim nyias nyias. … Tab sis cov peev txheej ua tau txav mus rau hauv ib qho kev taw qhia. Qhov no ua tiav vim cov sodium channels muaj lub sijhawm refractory tom qab ua kom, thaum lawv qhib tsis tau dua.
Vim li cas cov peev txheej ua haujlwm feem ntau taug kev tsis ncaj nraim hauv axon?
Myelin insulates lub axon kom tiv thaiv kom tsis txhob ntws tawm tam sim no thaum nws mus hauv axon. Nodes ntawm Ranvier yog qhov khoob hauv myelin raws axons; lawv muaj cov sodium thiab potassium ion channel, uas tso cai rau kev ua kom muaj peev xwm taug kev sai sai hauv axon los ntawmdhia ntawm ib ntawm mus rau lwm qhov.
Vim li cas qhov kev nqis tes ua tsuas yog taug kev ib txoj hauv kev hauv myelinated axon?
Kev nthuav tawm ntawm qhov ua tau tshwm sim tshwm sim hauv ib qho kev taw qhia nkaus xwb vim lub sijhawm luv luv ntawm Na+ channel thiab luv luv hyperpolarization tshwm sim los ntawm K + efflux (saib daim duab 21-14). … Hauv myelinated neurons, voltage-gated Na + channel yog concentrated ntawm nodes ntawm Ranvier.
Vim li cas thiaj muaj peev xwm taug kev hauv ib qho lus nug xwb?
Txoj kev muaj peev xwm taug kev hauv ib qho kev coj mus rau ib qho axon vim cov poov tshuaj raws hauv cov neuron refractory thiab tsis tuaj yeem qhib rau lub sijhawm luv tom qab lawv qhib thiab kaw. Kev ua haujlwm muaj peev xwm taug kev tsuas yog ib qho kev taw qhia hauv axon vim tias sodium channels hauv cov neuron yog refractory.
