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Bio Chap 28 Vocab 1

TermDefinition
Blastula Hollow ball that is formed when the zygote undergoes cell divisions.
Ectoderm The outer layer tissue that gives rise to the outer layer of skin, nervous system, and sense organs.
Endoderm Inter layer of tissue that gives rise to the digestive lining respiratory system and digestive organs.
Mesoderm Middle layer of tissue that gives rise to the skeletal system muscles and the circulatory system.
Body plan Describes an animal's shape, symmetry, and internal organization.
Asymmetrical Irregular in shape and sometimes their shapes depend on where they are growing.
Radial symmetry Body parts arranged around a central axis, somewhat like the spokes around a bicycle wheel.
Bilateral symmetry A body design in which there are distinct right and left halves.
Cephalization An anterior concentration of sensory structures and nerves.
Coelom A fluid-filled space found between the body wall and the digestive tract.
Acoelomates Animals with no body cavity.
Pseudocoelomates Animals with a body cavity located between the mesoderm and endoderm.
Coelomates Animals with a body cavity located entirely within the mesoderm.
Phylogenetic tree Shows how animals are related through evolution.
Gastrovascular cavity A digestive cavity with only one opening and no specialization within.
Created by: user-1849359
 

 



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