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Samenvatting Hoofstuk 6 gaswisseling

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~ hoort bij bundel te vinden op mijn pagina ~ Samengevat per paragraaf. 4vmbo gl-tl

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Hoofdstuk 6
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Hoofdstuk 6: Gaswisseling

Paragraaf 1 ➙Gaswisseling bij dieren:
Eencelligen: gaswisseling via celmembraan.
 Het oppervlak van het celmembraan is groot genoeg om voldoende zuurstof te
kunnen opnemen en voldoende koolstofdioxide te kunnen afgeven.
 Geen speciale ademhalingsorganen.

Veelcelligen:
o Groter dan eencellige.
o Oppervlak van het lichaam niet groot genoeg om voldoende zuurstof op te nemen en
koolstofdioxide af te staan.
o Lichaamsoppervlak ondoorlaatbaar voor zuurstof en koolstofdioxide.
o Speciale ademhalingsorganen: tracheeën, kieuwen, longen.

Insecten: gaswisseling in tracheeën.
 Tracheeën: sterk vertakte luchtbuizen die overal in het lichaam eindigen.
 Stigma’s: de openingen van de tracheeën.
 Veel soorten insecten verversen de lucht in de tracheeën door pompende
bewegingen met het achterlijf te maken.

Kieuwen: gaswisseling in kieuwen.
o De kieuwen liggen achter de kop in de kieuwholten.
o Kieuwdeksels bedekken de kieuwholten met daarin de kieuwen.
o Kieuwen bestaan uit kieuwbogen met kieuwplaatjes.
o Tussen de kieuwbogen bevinden zich kieuwspleten.
o In de kieuwplaatjes liggen veel fijne bloedvaatjes (haarvaten).
o Vissen verversen het water in de kieuwholten door via de bek en de kieuwdeksels
voortdurend water langs de kieuwen te laten stromen.




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