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terms for bios

unit 5

QuestionAnswer
acoelomates definition An animal that lacks a body cavity. Acoelomates, which include the flatworm, fluke, tapeworm, and ribbon worm. space between mesoderm and endoderm is filled with cells and organic materials.
pseudocoelomates definition three-layered bodies with a cavity between the endoderm and the mesoderm
endoderm definition one of three embryonic germ layers of early vertebrate embryos, destined to give rise to the epithelium that lines internal structures and most of the digestive and respiratory tracts.
mesoderm definition one of the three embryonic germ layers that form in the gastrula; gives rise to muscle, bone and other connective tissue, the peritoneum, the circulatory system, and most of the excretory and reproductive systems.
coelomates definition animals where the body cavity is completely lined with the mesoderm; covers the outside of the digestive system; ex=earthworms
differences between acoelomates pseudocoelomates, and coelomate pt.1 Acoelomates lack a coelom (do not have a true body cavity.) It is usually filled with cells. Pseudocoelomate has the beginnings of a body cavity, but lacks mesentery (or peritoneum).
differences between acoelomates pseudocoelomates, and coelomate pt.2 Coelomate animals have a "true" body cavity or coelom and organs are incased in peritoneal membrane
metazoa animal that undergoes development from an embryo stage with 3 tissue layers, namely the ectoderm, mesoderm, and endoderm. The term applies to all animals except the sponges; Having to do with animals that develop from an embryo with three tissue layers
parazoa an ancestral subkingdom of animals, literally translated as "beside the animals"
Created by: 100000903273874
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