Lub caij poob (los yog rov ua dua) theem ntawm qhov kev ua haujlwm muaj peev xwm yog nyob ntawm qhov qhib ntawm cov poov tshuaj. Thaum lub ncov ntawm depolarization, cov sodium channels kaw thiab potassium channel qhib. Potassium tawm ntawm cov neuron nrog cov concentration gradient thiab electrostatic siab.
Vim li cas potassium ua rau depolarization?
Membrane depolarization los ntawm elevated extracellular K + concentration ([K +]o) ua rau nrawm Na + nkag los ntawm qhov hluav taws xob-sensitive Na + channels rau hauv cov hlwb zoo siab.
Puas potassium ua rau hyperpolarization?
Cov membrane yog hyperpolarized tom kawg ntawm AP vim tias qhov hluav taws xob-gated potassium channel tau nce permeability rau K +. Thaum lawv kaw, daim nyias nyias rov qab mus rau qhov muaj peev xwm so, uas yog tsim los ntawm permeability los ntawm "kua" raws.
Puas potassium ua rau depolarization lossis repolarization?
Repolarization yog tshwm sim los ntawm kev kaw ntawm sodium ion channels thiab qhib cov poov tshuaj ion channels. Hyperpolarization tshwm sim vim muaj ntau tshaj ntawm qhib cov poov tshuaj thiab cov poov tshuaj efflux los ntawm lub cell.
Puas sodium lossis potassium ua rau depolarization?
Cov dej ntws sab hauv ntawm sodium ions nce qhov siab ntawm cov cations zoo hauv lub cell thiab ua raudepolarization, qhov uas lub peev xwm ntawm lub xovtooj siab dua li lub sijhawm so ntawm tes. Cov sodium channels kaw ntawm lub ncov ntawm lubmuaj peev xwm ua tau, thaum cov poov tshuaj tseem tawm hauv lub cell.
