Video: Qhov kev hloov pauv hauv daim nyias nyias ua rau muaj peev xwm ua tau li cas?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Tej yam peev xwm ua tau tshwm sim thaum sib txawv ions hla lub neuron daim nyias nyias . Ib qho kev txhawb nqa ua ntej ua rau sodium channel qhib. Vim tias muaj ntau ntau sodium ions nyob rau sab nraud, thiab sab hauv ntawm cov neuron yog qhov tsis zoo rau sab nraud, sodium ions maj nrawm rau hauv cov neuron.
Tom qab ntawd, ua li cas rau daim nyias nyias los ua kom muaj peev xwm ua tau?
Synaptic inputs rau ib tug neuron ua rau lub daim nyias nyias depolarize los yog hyperpolarize; uas yog, lawv ua rau cov membrane muaj peev xwm nce lossis poob. Tej yam peev xwm ua tau yog ua rau thaum txaus depolarization accumulates coj cov membrane muaj peev xwm mus txog qhov pib.
Qhov thib ob, 4 cov kauj ruam ntawm kev nqis tes ua yog dab tsi? Ib qho kev muaj peev xwm ua tau tshwm sim los ntawm qhov pib los yog suprathreshold stimuli raws li neuron. Nws muaj plaub theem; hypopolarization, depolarization , overshoot, thiab repolarization . Ib qho kev txiav txim muaj peev xwm nthuav tawm raws cov cell membrane ntawm ib qho axon kom txog thaum nws mus txog lub davhlau ya nyob twg khawm.
Nyob rau hauv txoj kev no, dab tsi kev hloov pauv hauv daim nyias nyias muaj peev xwm ua rau cov neuron yuav ua rau muaj peev xwm ua tau?
Nws ua rau cov neurons sab hauv cell daim nyias nyias ua ntau raug nqi zoo. A neuron yuav tsum tau depolarized rau qhov chaw pib nyob rau hauv thiaj li yuav tsim kom muaj peev xwm ua tau . Tej yam voltage hloov nyob rau hauv qhov kev taw qhia ua kom muaj cov neuron ntau dua tua hluav taws thiab yog li ntawd hu ua excitatory postsynaptic peev xwm (EPSP).
Dab tsi ua rau muaj peev xwm so membrane?
Membrane muaj peev xwm nyob rau hauv hlwb yog txiav txim feem ntau los ntawm peb yam : 1) cov concentration ntawm ions nyob rau sab hauv thiab sab nraud ntawm tes; 2) permeability ntawm lub cell daim nyias nyias rau cov ions (piv txwv li, ion conductance) los ntawm cov ions tshwj xeeb; thiab 3) los ntawm kev ua haujlwm ntawm cov twj siv hluav taws xob (piv txwv li, Na+/K+-ATPase thiab
Pom zoo:
Puas yog nws muaj tseeb tias nyob rau hauv kev thauj mus los ntawm kev txav ntawm cov khoom hla ib daim nyias nyias yuav tsum muaj zog?
Hauv kev thauj mus los passive, kev txav ntawm cov khoom hla ib daim nyias nyias yuav tsum muaj zog. _ Muaj tseeb_ 5. Endocytosis yog ib txoj kev uas ib lub cell membrane nyob ib puag ncig thiab siv cov khoom los ntawm ib puag ncig. Ib daim nyias nyias uas tso cai rau qee cov ntaub ntawv dhau los qhia txog kev xaiv permeability
Puas yog glycerol xav tau daim nyias nyias nyias kom hla daim nyias nyias?
Glycerol yog lipid soluble yog li nws diffuses los ntawm yooj yim diffusion ncaj qha los ntawm lub cell membrane thaum cov piam thaj yog ib tug polar molecule yog li nws diffuses los ntawm kev yooj yim diffusion uas txhais tau hais tias nws xav tau ib tug channel protein ua hauj lwm thiab qhov no txhais tau tias thaj chaw saum npoo rau cov piam thaj kom nkag mus yog tsawg dua. tshaj ib qho rau glycerol
Qhov kev hloov pauv twg yuav hloov daim duab A rau hauv daim duab B?
Ob daim duab tau hais tias yuav sib haum xeeb yog tias ib tus tuaj yeem tau txais los ntawm lwm tus los ntawm ib ntu ntawm kev txhais lus, kev xav, thiab kev sib hloov. Cov duab sib xws muaj qhov loj thiab zoo tib yam. Txhawm rau hloov daim duab A rau hauv daim duab B, koj yuav tsum xav txog nws hla y-axis thiab txhais ib chav nyob rau sab laug
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