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H19 sport biologie samenvatting 6vwo 2020/2021 $5.85   Add to cart

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H19 sport biologie samenvatting 6vwo 2020/2021

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Samenvatting heel hoofdstuk 19 -> paragraaf 1 tm 5

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  • Paragraaf 1 tm 5 h19
  • March 17, 2021
  • 4
  • 2020/2021
  • Summary
  • Secondary school
  • 6
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Bindweefsel koppelt andere weefsels aan elkaar en houdt organen op hun plek. Weefsel bestaat uit
cellen met veel tussencelstof (=gelachtig materiaal rond cellen met veel eiwitten)  meer ruimte
tussen cellen dan andere, contact via dunne uitlopers. In celmembraan hiervan bevinden zich
connexon-eiwitten. Waar celmembraan vd bindweefselcel celmembraan vd buurcel raakt  door
connexon-eiwitten  kleine opening in beide membranen, eiwitkanalen waar ionen duffunderen vd
ene  andere cel (= gap junctions). Deze zijn niet permanent.
Pezen verbinden skeletspieren met botten. Ze bevatten bundels collageenvezels, uit fibrillen, uit
collageenmoleculen, drievoudige helix van 3 collageenstrengen. Pezen brengen kracht vd spieren
over op botten. Lopen: achillespees drukt in door lichaamsgewicht, bij loskomen hiel komt
veerenergie vrij. Banden verbinden botten.

De spier bevat bundels spiervezels, uit bundels myofibrillen(samentrekking spier) met filamenten
van eiwitmoleculen myosine (dik) en actine (dun). Actinefilamenten zitten met 1 uiteinde vast aan
een tussenschot.




Uitsteeksels vd myosinefilamenten zitten vast aan actinefilamenten (alleen bij aanwezigheid van Ca2+).
Verbinding verbroken met ATP  later hersteld, filamenten schuiven in elkaar.




Dwarsgestreepte spier:
Z-lijn = begrenzing sarcomeer
A-band = lengte myosinevezels; DONKERE BAND
H-band = Ontspanning  breed; weinig overlap actine-&myosinevezels. Samentrekking  smaller
want sarcomeer schuift in elkaar, actinevezels schuiven tussen myosinevezels.
I-band = deel vh actine waar geen overlap is met myosine, bij ontspanning breed, gespannen smal.
LICHTE BAND.
M-lijn = geeft aan waar
verbindingen tussen
afzonderlijke
myosinevezels zitten.

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