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Biology Ch 32

Intro to Animal Diversity

Nutrition feed by ingesting food, digesting within their bodies
Collagen protein between cells to provide structure/support
Nerve Cells rapid communication and integration of environmental stimuli
Muscle Cells body movement
Skin regulate water loss
Circulatory System internal transport of nutrients and respiratory gasses
Reproduction sexual life cycle dominated by diploid stage
Diploid _________ formed from fertilization Zygote
Cleavage Succession of mitotic cell divisions without cell growth
Blastula Single layer of cells surrounding blastocel
Gastrulation Formation of blastopore, adult tissue types develop
Choanoflagellates (protist) are the closest living relative to animals
Body Plan set of morphological and developmental traits
Symmetry relative shape of body
Radial Symmetry body parts arranged around one main (central) axis
Bilateral Symmetry one plane divides the animal into similar halves
Cephalization concentration of sensory tissue at anterior end of body
Asymmetry no plan of symmetry (no defined shape)
Tissues specialized cells insulated from other tissues by membranous layers
Ectoderm germ layer covering surface of embryo
Endoderm inner most germ layer that lines the archenteron (digestive tract)
Diploblastic (jellyfish/corals) have 2 layers
Triploblastic all other animals
Mesoderm layer between ecto- and endo-
Body Cavity presence or absence of a body cavity
Coelom fluid-filled spare between digestive tract and boy wall
Acoelomate lacks a body cavity
Psedocoelomate fluid-filled cavity but not lined with mesoderm tissue
Coelomate cavity lined with mesoderm tissue
Mesoderm Tissue internal organs move and grow independently of body wall
Example: Ectoderm Skin, brain/nervous tissue
Example: Mesoderm Muscles, bone blood, reproductive organ
Example: Endoderm Digestive and respiration organs
Created by: mlcianfrone2006
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