Lecture 23 Animal Adaptation KRG (2) [Read-Only]

Lecture 23 Animal Adaptation KRG (2) [Read-Only] - Lecture...

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Lecture 23 The animals But first……….
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What is an animal? c Key features r Multicellularity r Heterotrophic metabolism r Internal digestion r Movement Can synthesize few organic molecules, must take in other ways Four key features to animal body plans c The symmetry of the body c The structure of the body cavity c The segmentation of the body c External appendages that are used for sensing, chewing, locomotion, mating, and other functions
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Symmetry c Symmetry = the overall shape of the animal r Shape allows for division by at least one plane into similar halves r Most animals are symmetrical Symmetry comes in two forms
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Bilateral symmetry is associated with cephalization : Concentration of sensory organs and nerve tissues at the anterior end or head. The anterior end encounters the environment first. Cephalization has been evolutionarily favored. Front vs . back in bilaterally symmetric animals
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Echinoderms have larvae with bilateral and adults with
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This note was uploaded on 04/18/2011 for the course BIO 182 taught by Professor Jacobson during the Fall '11 term at ASU.

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Lecture 23 Animal Adaptation KRG (2) [Read-Only] - Lecture...

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