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Summary

samenvatting spierstelsel

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dit is een samenvatting van het spierstelsel

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  • June 4, 2023
  • 7
  • 2022/2023
  • Summary
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1 Spierstelsel


Functies

- In stand brengen van bewegingen
- Handhaven van de normale houding
- Beschermen van weke delen
- Produceren van warmte

De bouw

Soorten spierweefsels




Hartspierweefsel:

 Cardiomyocyten en Myocardiocyten: hartspiercellen
 Myocard: hartspier



Fysiologie van de skeletspieren

, 2 Spierstelsel


Spiervezels opgebouwd uit myofibrillen -> lichte en donkere banden -> sacromeren (kleinste
contractie eenheid van de spier)




Als de spier samentrekt overlappen beide filamenten waardoor de spier korter wordt.




Innervatie of bezenuwing van de spieren

- Samentrekken door signalen of impulsen vanuit het zenuwstelsel
- Sensorische of motorische innervatie vanuit de spiervezels nodig
- Innervatie = voorziening door zenuw

Sensorische innervatie: om de hersenen te laten weten wat de stand is van de spievezel

Motorische zenuwvezels: geleiden de prikkels die de spiervezels in beweging brengen



Spiertonus

= bassispanning

- Deel van de vezels in rust en ander deel samentrekt -> rusten en actief zijn vd spiervezels
worden afgewisseld

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