Summary
samenvatting spierstelsel
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- Institution
dit is een samenvatting van het spierstelsel
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1 SpierstelselFuncties
- 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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