Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Name and describe the characteristics of the phylum Cnidaria. Name an animal in phylum Cnidaria that we studied in lab. 

 

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Introduction:- The name cnidaria replaced the older term coelenterata. Ex:- jelly fishes,sea anemones etc..

Characteristics of cnidaria:-

  • Cinedocytes present that house stinging organelles called nematocysts.
  • Body multi cellular, few tissues, some organelles.
  • Diploblastic animals.
  • Radially symmetrical.
  • Body contains an gastrovascular cavity and a mouth.
  • Two different forms exist they are polyp and medusa.
  • Many colonial forms exhibit polymorphism.
  • Reproduction is asexual or sexual.
  • Has a simple net like nervous system.
  • Has a distinct larval stage which is planktonic.
  • Lives in aquatic environment mostly they are marine.
  • Indirect development.
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