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Samenvatting hoofdstuk 7: Cnidaria $7.47   Add to cart

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Samenvatting hoofdstuk 7: Cnidaria

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Volledige samenvatting van hoofdstuk 7 gebaseerd op lesnotities en de cursus

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  • November 1, 2023
  • 5
  • 2022/2023
  • Summary
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HOOFDSTUK 7: Cnidaria



1. Inleiding en diganose



Morfologie

- Multicellulair
- Biradiaal symmetrisch
- Klokvormige medusae of cilindervormige poliepen
- 2 dunne lagen  ROND  centrale spijsverteringsholte
- Hydrostatisch skelet of elastisch skelet
- Holle tentakels

Fysiologie

- Functies  d.m.v.  individuele cellen
- Diffuus netwerk  VAN  zenuwen
- Cnidoblasten  GEBRUIKT VOOR  predatie  verdediging
- MEESTAL  carnivoor

Voortbeweging

- Poliepen  MEESTAL  sessiel
- Larven  zwemmen  d.m.v.  cilia
- Medusae  zwemmen  d.m.v.  trage golfbewegingen

Voortplanting generatiewisseling:

- Asexueel  DOOR  deling of knopvorming
- Sexueel  MEESTAL  gescheiden geslachten

Ontwikkeling

- Embryo  ZONDER kiemlagen
- Indirecte ontwikkeling
- Gecilieerde
- Planulalarve

Habitat

- Vrijlevend  IN  water
- MEESTAL  marien
- Wereldwijde verspreiding

Grootte

- 1mm – 70 m

Diversiteit

- Ongeveer 9,000 beschreven recente soorten

, 2. Bouwplan

2.1. Algemene opbouw van het lichaam

- 3 lagen
o Epidermis  buitenste cellaag
 Myo-epitheliale  contractie
 Cnidoblasten  netcellen
 Interstitiële cellen  niet gedifferentieerde cellen
 Kliercellen
o Mesoglea  steunlaag
o Gastrodermis  binnenste cellaag
 Myo-eptheliale  contractie
 Kliercellen
 Interstitële cellen
- Echte weefsels
- Centrale holte
- Tentakels
- ONVOLLEDIG  spijsverteringskanaal




2.2. Structuur van en poliep

- Cilindrische lichaam
- Vrije uiteinde
- 6 tot 8 tentakels
- Mond  LIGT TUSSEN  tentakels  AAN  top
- UITEINDE  versmalt  VORMT  voetschijf  FUNCTIE  vasthecht

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