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Samenvatting Locomotorisch stelsel
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duidelijke samenvatting, met dit hoofdstuk en de andere hoofdstukken ben ik op het examen anatomie & fysiologie deel 2 goed geslaagd
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Locomotorisch stelselKijken naar schema’s met benamingen!!!
7.Spieren en pezen
Eigenschappen gestreepte spiercel:
- Meerdere wandstandige kernen
- Zeer goed doorbloed en veel mitochondiën intens metabolisme mogelijk
- Sensoren in spier
- Sensoren in pezen
Streping in myofibril:
- Myofybril = kabelvormige eiwitketen
o Gelegen in spiervezel of spiercel
o Hier vindt contractie plaats
o Zijn onder meer opgebouwd uit myofilamenten
= contractiele spiereiwitten, namelijk actine en myosine
2 soorten eiwitvezels die parallel gerangschikt zijn en elkaar gedeeltelijk overlappen
Dikke vezels met uistekende “handjes”: myosine
Dunne vezels: actine
Spiercontractie:
zenuwimpuls in motorisch neuron acetylcholine vrijzetting in de synaptische spleet van neuro-musculaire
junctie acetylcholine past op de receptoren van motorische eindplaat Ca2+ influx indien ATP in spiercel
“handjes” van myosine slaan uit en trekken de actine filamenten naar elkaar toe overlappende gedeelten
wordt groter: spiercontractie
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