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Samenvatting HS3 weefsels fysio 2021

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Uploaded on
March 26, 2021
Number of pages
7
Written in
2020/2021
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Hoofdstuk3: weefsels



Hoofdstuk 3. Weefsels
Inleiding
 Situering




 De weefselleer onderzoekt de opbouw en de bijzondere functies (specialisatie) van de
weefsels, dus van groepjes cellen die dezelfde functie vervullen.
 De verschillende organen van het lichaam zijn uit wisselende combinaties van deze weefsels
samengesteld. Ook de studie van de (microscopische) opbouw van de organen wordt tot de
weefselleer gerekend.

1. epitheelweefsel
Het epitheelweefsel bedekt:

 Lichaamsoppervlakken
 Lichaamsholtes
 Klieren

1.1 bouw en indeling
 Epitheelcellen
‐ Zitten dicht op elkaar
‐ Vormen een sterk membraan
‐ Geen ruimte voor bloedvaten
o Voeding van onderliggende weefsels, nl. bindweefsel
‐ Continue vervangen

, 1.2 Functie
 De bescherming van het lichaam

 Opname en afgifte van stoffen

 Tastzintuigen

2. bindweefsel
 Wat?

‐ Gespecialiseerde cellen in grote hoeveelheid tussencelstof

= gel met koolhydraten, eiwitten +
bindweefselvezels

‐ Aard van intercellulaire matrix  eigenschappen

o 2 vormen:

 Vloeibaar

 Stevig, compact

 Bindweefselvezels

‐ Collageenvezels

o Eiwit collageen

o Vorm behouden

‐ Reticulaire vezels

o Collageen + Reticulumcel

o Steun aan cellen beenmerg en lymfoïde organen

‐ Elastische vezels

o Dunne, goed rekbare vezels

o Wanden bloedvat: rekbaar

 Bindweefselvormen




‐ Losmazig bindweefsel
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