animalia

18 terms by sea-air-ah 

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characteristics of an animal

-sexual reproduction
-motility (moves)
-heterotrophs
-multicellular
-eukaryotic
-diploid
-no cell wall

two major divisions

-invertebrates (no back bone)
-vertebrates (back bone)

tissues

a group of cells that have the same function

derms

layers of cells that give rise to organs

three derms

-ectoderm
-mesoderm
-endoderm

ectoderm

nervous system, sense, skin

mesoderm

skeletal system, muscle system, circulatory system

symmetry (three types)

-asymmetry
-radial symmetry
-bilateral symmetry

coelom

fluid filled cavity laying within cells produced by mesoderm

acoelomate

animal with no coelom

pseudocoelom

coelon that is within cells produced from mesoderm and endoderm

coelomate

has coelom

blastula

an embryonic stage that marks the end of cleavage during animal development; a hollow ball of cells in many species.

gastrula

the embryonic stage resulting from gastrulation in animal development. most animals have a gastrula made up of three layers of cells: endoderm, ectoderm, and mesoderm

body cavity

a fluid containing space between the digestive tract and the body wall.

hydrostatic skeleton

a skeletal system composed of fluid held under pressure in a closed body compartment; the main skeleton of most cnidarians, flatworms, nematodes, and annelids.

eumetazoans

the animals with "true tissues" (all animals except sponges)

bilaterians

animals that exhibit bilateral symmetry

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