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Samenvatting - RAF1 - orgaanstelsel - spierweefsel

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Deze samenvatting bestaat uit de anatomie en fysiologie van het spierweefsel van de mens. Er zijn ook afbeeldingen die de theorie kunnen verduidelijken.

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Basis orgaanstelsel
Spierweefsel
Spierstelsel:

Soorten spierweefsel

 Willekeurige beheersing
o Skeletspieren
 Spierstelsel
 Onwillekeurige beheersing
o Hartspier
 hartwand
o Gladde spieren
 Inwendige organen



Skeletspierweefsel:

= zijn direct of indirect met botten verbonden en hebben 5 functies.

 Bewegingen van skelet
 Behoud van houding en lichaamspositie
 Steun aan weke delen
 Beschermen van in- en uitgangen
 Behoud lichaamstemperatuur

Bouw en organisatie van skeletspier

 Bindweefselorganisatie
o Epimysium
 Vezelige omhulling van de hele spier
o Perimysium
 Vezelige omhulling van een fasciculus (bundel)
o Endomysium
 Vezelige omhulling van één enkele cel (spiervezel)
o Pezen (of aponeurose)




1

, Skeletspiervezels

 Sarcolemma (= spiercelmembraan)
 Transverse tubuli (T-tubuli)
 Sarcoplasma (= spiercytoplasma)
 Sarcoplastmatisch reticulum (SR) (= een
soort glad ER)
 Sarcomeren




Skeletspiervezels:

T-tubuli

 Netwerk van smalle buisjes gevuld met EC vloeistof
 Elektrische impulsen bereiken binnenkant van cel

Myofibrillen

 Bundel van dikke (myosine) en dunne (actine) filamenten
 Contractie van spiervezels
 Aan beide uiteinden aan sarcolemma
 ATP nodig (mitochondriën en glycogeenkorrels verspreid tussen myofibrillen)

Sarcoplasmatisch reticulum

= gespecialiseerde vorm van glad ER

 T-tubuli stevig verbonden met membranen van SR
 Buisvormig netwerk rond myofibrillen
 Hoge concentratie calcium in terminale cisternae
 Vrijstelling om spiercontractie te realiseren



Anatomie van skeletspieren:

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Written in
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