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Biology
WCHS Biology Chapter 25
| Word | Definition |
|---|---|
| Sessile | organism that is permanently attached to a surface |
| Blastula | hollow ball of cells in a layer surrounding a fluid-filled space; an animal embryo after cleavage but before the formation of the gastrula |
| Gastrula | animal embryo development stage where cells on one side of the blastula move inward forming a cavity of two or three layers of cells with an opening at one end |
| Ectoderm | layer of cells on the outer surface of the gastrula; eventually develops into the skin and nervous tissue of an animal |
| Endoderm | layer of cells on the inner surface of the gastrula; will eventually develop into the lining of the animal's digestive tract and organs associated with digestion |
| Mesoderm | middle cell layer in the gastrula, between the ectoderm and the endoderm; develops into the muscles, circulatory system, excretory system, and in some animals, the respiratory system |
| Protostome | animal with a mouth that develops from the opening in the gastrula |
| Deuterostome | animal whose mouth develops from cells other than those at the opening of the gastrula |
| Symmetry | a term that describes the arrangement of body structures |
| Radial Symmetry | an animal's body plan that can be divided along any plane, through a central axis, into roughly equal halves |
| Bilateral Symmetry | animals with a body plan that can be divided down its length into two similiar right and left halves that form mirror images of each other |
| Anterior | head end of bilateral animals where sensory organs are often located |
| Posterior | tail end of bilaterally symmetric animals |
| Dorsal | upper surface of bilaterally symmetric animals |
| Ventral | lower surface of bilaterally symmetric animals |
| Acoelomate | an animal with no body cavities |
| Pseudocoelom | fluid-filled body cavity lined with mesoderm |
| Coelom | fluid-filled body cavity completely surrounded by mesoderm |
| Exoskeleton | hard covering on the outside of some animals, including spiders and mollusks; provides a frame-work for support, protects soft body tissues, and provides a place for muscle attachment |
| Invertebrate | animal that does not have a backbone |
| Endoskeleton | internal skeleton; provides support, protects internal organs, and acts as an internal brace for muscles to pull against |
| Vertebrate | an animal with an endoskeleton and a backbone |
Created by:
dmoudy
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