WEBVTT

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Știm din ultimul video că dacă
avem o concentrație mare

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de calciu ionic în celula musculară, 
acești ioni

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de calciu se vor lega 
de troponină care va le

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schimba formele într-un fel
în care tropomiozina va

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

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urca de-a lungul
filamentelor de actină și apoi vom

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avea de fapt, 
contracții musculare.

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Deci concentrație ridicată de calciu, 
sau concentrația ionilor de calciu,

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avem contracție.

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

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confirmarea lor standard și
ele trag-- sau poți spune

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mută tropomiozina înapoi 
în calea capetelor de

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miozină-- și nu avem contracție.

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Deci următoarea întrebare firească este, 
cum regulează mușchiul

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dacă avem concentrația
de calciu ridicată și

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contracția sau concentrația
de calciu scăzută și relaxare?

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Sau chiar o întrebare
mai bună este, cum face

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sistemul nervos asta?

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Cum le spune sistemul nervos 
mușchilor să se contracte,

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să facă concentrația de calciu ridicată și

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contracție sau să o facă 
scăzută din nou și relaxare?

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

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ceea ce am învățat în
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 
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
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 
pentru a nu deveni confuz.

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Acesta este axonul.

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Îl putem numi capătul 
terminalului unui axon.

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Asta este sinapsa.

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Doar puțină terminologie din
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 
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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