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18 terms

animalia

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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