| Term | Definition |
|---|
| endoderm | inner layer of tissue, forms the digestive tract |
| mesoderm | middle layer of tissue, forms muscles |
| ectoderm | outer layer of tissue, forms skin |
| triploblastic | an organism with all three tissue layers |
| diploblastic | an organism with only two tissue layers |
| parazoa | an organism without tissue layers |
| asymmetrical | an organism with no body plan is _________ |
| radial symmetry | body plan symmetry around a central axis, such as a jellyfish or a tulip |
| bilateral symmetry | an organism that can be divided into two equal halves |
| anterior | the front part of an organism with bilateral symmetry where it's head usually is |
| dorsal | the top of an organism with bilateral symmetry |
| ventral | the bottom of an organism with bilateral symmetry |
| posterior | the butt end of an organism with bilateral symmetry |
| cephalization | the concentration of sense organs and nerve cells in the front (anterior) of the body |
| ceolom | body cavity |
| acoelomate | an organism with no body cavity, true or otherwise |
| pseudocoelomate | an organism with a body cavity that isn't completely lined in mesoderm |
| ceolomate | an organism with a "true" body cavity, meaning one who's cavity is completely lined with mesoderm |
| zygote | a fertilized egg |
| blastula | a hollow ball of embryonic cells |
| gastrulation | the process of the blastula folding and forming tissue layers |
| gastrula | the folded blastula |
| blastopore | the opening at the bottom of the gastrula that becomes one end of the digestive tract |
| protosome | an organism who's blastopore forms the mouth (worms, arthopods, and mollusks) |
| deuterosome | an organism who's blastopore forms an anus (echinoderms and chordates) |
| intracellular digestion | digestion within a cell |
| extracellular digestion | digestion outside of cells (in a stomach) |
| gastrovascular cavity | a digestive system with 1 opening |
| true digestive tract | a digestive system with 2 openings |
| open circulatory system | a ciculatory system where blood does not always stay in vessels; it is less efficient; grasshoppers use it |
| closed circulatory system | a circulatory system in which blood always stays in vessel |
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