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Samenvatting biologie nectar hoofdstuk 2 Bewegen 1 havo/vwo samenatting

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biologie nectar hoofdstuk 2 Bewegen 1 havo/vwo samenatting. biologie nectar hoofdstuk 2 Bewegen 1 havo/vwo samenatting. biologie nectar hoofdstuk 2 Bewegen 1 havo/vwo samenatting. biologie nectar hoofdstuk 2 Bewegen 1 havo/vwo samenatting..

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Samenvatting biologie hoofdstuk 2: Botten

2.1: Botten




Je hebt meer dan 200 botten in je lichaam → bij elkaar heet dat: skelet



Schedel: alle botten in hoofd

→ schedel wordt gedragen door wervelkolom

Borstkas: ribben + borstwervels + borstbeen

Bekken (heupen): alle heupbeenderen

→ aan heupen zitten dijbeenderen vast (langste botten die je hebt)

Ellepijp: loopt van de ELLEboog naar de kant van Pink



In handen en voeten zitten veel kleine botjes:




Functies van het skelet:

* Stevigheid

, * Vorm geven

* Bescherming geven

. * Beweging (spieren zitten aan botten vast)




Botten bestaan uit volgende stoffen:



* Been:

- Beencellen maken een stevige stof met veel kalk en een beetje lijmstof

- Hard en stevig (de kalk geeft stevigheid)



* Kraakbeen

- Kraakbeencellen met gelei tussen de cellen: Veel lijmstof, weinig kalk

- Buigzaam (door veel lijmstof)

- Bijvoorbeeld: - bij verbinding van ribben en borstbeen,

waardoor op en neer bewegen Bij ademhaling mogelijk is.

- in gewrichten en tussen wervels

- oorschelp en neus



Hoe ouder je wordt, hoe minder lijmstof. Kraakbeen verandert dan in been. Daardoor zijn botten van
oudere mensen minder buigzaam.



Wervelkolom bestaat uit wervels.

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