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Samenvatting Lichaamsbekleding dieren $4.83
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Samenvatting Lichaamsbekleding dieren

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Onderdeel van biologie. Lichaamsbekleding zoals hoornachtige stoffen worden besproken, alsook enkele moeilijkere begrippen.

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  • December 31, 2023
  • 5
  • 2023/2024
  • Summary
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Lichaamsbekleding
Hoornvormingen
Haar
Stekels
 Dikkere haren met een schorslaag die meer hoornstof bevat
Schubben
 Sterkere verhoorning van de huid in afgelijnde stroken
 Vooral bij reptielen
 Bij zoogdieren: op buikzijde en staart, vb bever op staart
Eeltkussens
 Op voetzolen en handpalmen van aantal
zoogdieren
 Verdikkingen van de hoornlaag
 Vb katten kunnen klauwen in eeltkussen
terugtrekken om geruisloos te lopen, honden
kunnen dit niet
Klauwen, nagels en hoeven
 Aan toppen van vingers en tenen
 Afbeelding hiernaast
Horens
 Neushoorn: uitsluitend hoornstof
 Overige zoogdieren: uitgroei van
voorhoofdsbeen tot beenpit, daarrond horens




Vissen

, Reptielen
Korrels  isodiametrisch
Schubben  overdekken elkaar
Schilden  sluiten aan zonder overdekking

Hoornlaag: periodisch afgeworpen en vervangen

Slijm:
 Beperkt het afslijten van de opperhuid door wrijving
 Maakt lichaamsoppervlak glibberig voor vijanden
 Voorkomt binnendringen en innestelen van bacteriën
 Komt tussen in de osmoregulatie




Amfibieën

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