0:00:00.750,0:00:04.480
Știm din ultimul video că dacă[br]avem o concentrație mare

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de calciu ionic în celula musculară, [br]acești ioni

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de calciu se vor lega [br]de troponină care va le

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schimba formele într-un fel[br]în care tropomiozina va

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fi dată la o parte și deci apoi [br]capetele de miozină pot

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urca de-a lungul[br]filamentelor de actină și apoi vom

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avea de fapt, [br]contracții musculare.

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Deci concentrație ridicată de calciu, [br]sau concentrația ionilor de calciu,

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avem contracție.

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Concentrație scăzută de ioni de calciu,[br]aceste proteine ​​troponine merg la

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confirmarea lor standard și[br]ele trag-- sau poți spune

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mută tropomiozina înapoi [br]în calea capetelor de

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miozină-- și nu avem contracție.

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Deci următoarea întrebare firească este, [br]cum regulează mușchiul

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dacă avem concentrația[br]de calciu ridicată și

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contracția sau concentrația[br]de calciu scăzută și relaxare?

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Sau chiar o întrebare[br]mai bună este, cum face

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sistemul nervos asta?

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Cum le spune sistemul nervos [br]mușchilor să se contracte,

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să facă concentrația de calciu ridicată și

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contracție sau să o facă [br]scăzută din nou și relaxare?

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Și pentru a înțelege asta, [br]hai să facem o mică recenzie a

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ceea ce am învățat în[br]videoclipurile despre neuroni.

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Lasă-mă să desenez terminalul jocțiunei

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unui axon, aici.

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În loc să aibă o sinapsă [br]cu o dendrită a unui alt

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neuron, va avea o sinapsă cu o

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celulă musculară reală.

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Deci aici este sinapsa[br]cu celula musculară reală.

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Asta este o sinapsă cu o celulă musculară.

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Lasă-mă să notez tot [br]pentru a nu deveni confuz.

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Acesta este axonul.

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Îl putem numi capătul [br]terminalului unui axon.

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Asta este sinapsa.

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Doar puțină terminologie din[br]videoclipurile despre neuroni-- acest spațiu

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era o despicătură sinaptică.

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Acesta este neuronul presinaptic.

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Ăsta este-- cred că [br]îl poți vedea cumva--

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celula postsinaptică.

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Nu este un neuron în acest caz.

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