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Chapter 24 Biology 2
| Question | Answer |
|---|---|
| invertebrate | animals without a backbone; between 95 to 99 percent of animal species are invertebrates |
| exoskeleton | hard or tough outer covering in many invertebrates that provides support, protects body tissue, prevents water loss, and protects the organism from predation. |
| endoskeleton | internal skeleton that protects internal organs, provides support to the organism’s body, and can provide an internal race or muscles to pull against. |
| vertebrate | animals with an endoskeleton and a backbone |
| hermaphrodte | animals that produces both sperm and egg in its body, generally at different times. |
| zygote | ertilized egg formed when a sperm cell penetrates an egg |
| internal ferilization | type of fertilization that occurs when sperm and egg combines inside an animal’s body |
| external fertilization | ype of fertilization that occurs with sperm and egg combines outside an animal’s body |
| blastula | fluid-filled ball of cells formed by mitotic cells division of the embryo. |
| gastrula | two-cell-layer sac with an opening at one end that forms from the blastula during embryonic development. |
| endoderm | inner layer of cells in the gastrula that develops into digestive organs and the digestive tract lining. |
| ectoderm | outer layer of cells in the gastrula that develop into nervous tissues and skin. |
| mesoderm | layer of cell between the endoderm and the ectoderm that can become muscle tissue and tissue of the circulatory, respiratory, and excretory system. |
| symmmetry | balance or similarity in body structures of organism |
| radial symmetry | body plan that can be divided along any plane, through a central axis, into roughly equal halves |
| bilateral symmetry | body plan that can be divided into mirror images along only one pance through the central axis |
| anterior | head end of an animal with bilateral symmetry |
| posterior | tail end of an animal with bilateral symmetry |
| cephalization | tendency to concentrate sensory organs and nervous tissue at an animal’s anterior end |
| dorsal | backside of an animal with bilateral symmetry |
| ventral | underside or belly of an animal with bilateral symmetry |
| coelom | fluid-filled body cavity completely surrounded by mesoderm |
| pseudocoelom | luid-filled body cavity between the mesodermand the endoderm |
| acoelomate | animals with a solid body that lacks a fluid-filled body cavity between the gut and the body wall |
| protostome | oelomate animals whose mouth develops from the opening in the gastrula |
| deutrostome | coelomate animal whose anus develops from the opening in the gastrula |
| filter feeder | organism that filters small particles from water to get its food |
| sessile | organism permanently attached to one place |
| cnidocyte | nematocyst-containing stinging cell on a cnidarian’s tentacle |
| nematocyst | capsule whose threadlike tube contains poison and barbs and is discharged when prey touches a cnidarian. |
| gastrovascular cavity | in cnidarians, the space surrounded by an inner cell layer, where digestion takes place. |
| nerve net | cnidarian nervous system that conducts impulses to and from all parts of the body |
| polyp | tube-shaped, sessile body from of cnidarians |
| medusa | umbrella shaped, free-swimming body form of cnidarians |
Created by:
karenbracamontes
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