Puas yog tag nrho cov hlwb puas muaj peev xwm ua kom lub cev so?

2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36

Yuav luag tag nrho ntshav ntshav daim nyias nyias muaj ib qho hluav taws xob peev xwm hla lawv, nrog rau sab hauv feem ntau tsis zoo nrog rau sab nraud. Hauv qhov tsis txaus siab hlwb , thiab nyob rau hauv excitable hlwb nyob rau hauv lawv lub hauv paus xeev, cov membrane muaj peev xwm yog tuav ntawm tus nqi ruaj khov, hu ua so peev xwm.

Tom qab ntawd, puas yog qhov so ntawm daim nyias nyias muaj peev xwm zoo ib yam hauv txhua lub hlwb?

Hauv feem ntau so neurons, ua peev xwm qhov sib txawv ntawm cov daim nyias nyias yog hais txog 30 mus rau 90 mVstart ntawv, m, V, ntawv kawg (ib mVstart ntawv, m, V, ntawv kawg yog 1/1000 1/1000 1/1000 ntawm ib volt), nrog rau sab hauv cell tsis zoo tshaj sab nraud.

Kuj Paub, vim li cas cov hlwb thiaj li muaj peev xwm so membrane? Resting Membrane Potential . Qhov no voltage yog hu ua so membrane muaj peev xwm ; nws yog tshwm sim los ntawm qhov sib txawv ntawm cov concentrations ntawm ions sab hauv thiab sab nraud cell . Yog tias daim nyias nyias tau sib npaug permeable rau tag nrho cov ions, txhua hom ion yuav ntws hla lub daim nyias nyias thiab qhov system yuav ncav cuag equilibrium.

Qhov thib ob, cov hlwb twg muaj peev xwm so tau?

Tag nrho hlwb hauv lub cev muaj tus yam ntxwv so daim nyias nyias peev xwm nyob ntawm lawv cell hom. Ntawm qhov tseem ceeb, txawm li cas los xij, yog neurons thiab tag nrho peb hom nqaij hlwb : smooth, skeletal, thiab cardiac.

Dab tsi yog qhov chaw so membrane muaj peev xwm thiab nws tsim tau li cas?

Cov so membrane muaj peev xwm (RMP) yog vim muaj kev hloov pauv hauv daim nyias nyias permeability rau poov tshuaj, sodium, calcium, thiab chloride, uas tshwm sim los ntawm kev txav ntawm cov ions thoob plaws nws. Ib zaug lub daim nyias nyias yog polarized, nws kis tau tus voltage, uas yog qhov txawv ntawm muaj peev xwm nruab nrab ntawm intra thiab extracellular qhov chaw.