Video: Dab tsi yog qhov so membrane muaj peev xwm quizlet?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov ntsiab lus hauv pawg no (57)
Resting membrane muaj peev xwm yog hluav taws xob peev xwm lub zog (voltage) uas tshwm sim los ntawm kev sib cais cov nqi sib txawv thoob plaws lub plasma daim nyias nyias thaum cov nqi no tsis txhawb lub cell (cell daim nyias nyias yog at so ). Nyob rau hauv lub cell daim nyias nyias yog qhov tsis zoo tshaj sab nraud
Tib neeg kuj nug, dab tsi yog qhov so ntawm daim nyias nyias ntawm lub neuron?
Cov so membrane peev xwm ntawm ib tug neuron yog hais txog -70 mV (mV = millivolt) - qhov no txhais tau hais tias nyob rau hauv lub neuron yog 70 mV tsawg dua sab nraud. Ntawm so , muaj ntau ntau sodium ions sab nraum lub neuron thiab ntau cov poov tshuaj ions hauv qhov ntawd neuron.
Tsis tas li ntawd, vim li cas thiaj li muaj peev xwm so ntawm daim nyias nyias? Resting Membrane Potential . Qhov voltage no 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 ntawm tes. 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 qhov sib npaug.
Ua raws li qhov no saib, dab tsi yog qhov so ntawm daim nyias nyias 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.
Yuav ua li cas yog ib tug membrane muaj peev xwm quizlet?
Cov membrane muaj peev xwm (V) yog tus peev xwm qhov sib txawv ntawm lub cell daim nyias nyias ; nws yog ib txwm qhia raws li tus peev xwm nyob rau hauv lub cell txheeb ze rau sab nraud: V = Vin - Vout. (Lub sab nraud suav hais tias yog av, lossis xoom.)
Pom zoo:
Dab tsi yog qhov zoo sib xws thiab qhov sib txawv ntawm kinetic thiab lub zog muaj peev xwm?
Lub Zog Muaj Peev Xwm yog lub zog khaws cia hauv ib qho khoom lossis qhov system vim nws txoj haujlwm lossis kev teeb tsa. Kinetic zog ntawm ib yam khoom yog txheeb ze rau lwm yam khoom txav thiab nyob ruaj ruaj hauv nws qhov chaw tam sim ntawd
Dab tsi yog 5 hom kev muaj peev xwm muaj zog?
Kev nthuav qhia, 5 Hom Muaj Peev Xwm Muaj Zog. Lub zog muaj peev xwm yog khaws cia lub zog uas tuaj yeem hloov mus rau kinetic zog. Muaj ntau hom kev siv zog xws li gravitational, magnetic, hluav taws xob, tshuaj, thiab elastic muaj peev xwm zog
Dab tsi yog qhov txawv ntawm electrostatic muaj peev xwm thiab electrostatic muaj peev xwm zog?
Tsis muaj qhov sib txawv ntawm electrostatic potentialenergy thiab hluav taws xob (al) muaj peev xwm zog. Lub peev xwm hluav taws xob ntawm ib qho taw tes yog kev ua haujlwm los ntawm lwm qhov kev quab yuam hauv kev txav chav tsev zoo los ntawm ib qho arbitrarilychosen xoom ntawm lub peev xwm (feem ntau infinity) mus rau lub ntsiab lus
Puas muaj peev xwm hluav taws xob thiab lub zog muaj peev xwm tib yam Vim li cas lossis vim li cas ho tsis?
Lub zog muaj peev xwm hluav taws xob Ue yog lub zog muaj peev xwm khaws cia thaum cov nqi tawm ntawm qhov sib npaug (xws li lub zog muaj peev xwm gravitational). Lub peev xwm hluav taws xob zoo ib yam, tab sis ib tus nqi, Ueq. Ib qho hluav taws xob muaj peev xwm sib txawv ntawm ob lub ntsiab lus hu ua voltage, V = Ue2q−Ue1q
Puas muaj peev xwm equilibrium zoo ib yam li so muaj peev xwm?
Qhov sib txawv ntawm daim nyias nyias muaj peev xwm thiab qhov muaj peev xwm sib npaug (-142 mV) sawv cev rau lub zog hluav taws xob hluav taws xob uas tsav Na + mus rau hauv lub xovtooj ntawm lub peev xwm so membrane. Thaum so, txawm li cas los xij, qhov permeability ntawm daim nyias nyias mus rau Na + tsawg heev kom tsuas yog me me Na + xau rau hauv lub cell