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Ch. 24 vocabulary
Introduction to Animals
| Question | Answer |
|---|---|
| Animal without a backbone; between 95 and 99 percent of animal species are invertebrates. | Invertebrate |
| Hard or tough outer covering of many invertebrates that provides support, protects body tissues, prevents water loss, and protects the organism for predation. | Exoskeleton |
| Internal skeleton that protects internal organs, provides support for the organism's body, and can provide an internal brace for muscles to pull against. | Endoskeleton |
| Animal with an endoskeleton and a backbone. | Vertebrate |
| Animal that produces both sperm and eggs in its body, generally at different times. | Hermaphrodite |
| Fertilized egg formed when a sperm cell penetrates an egg. | Zygote |
| Type of fertilization that occurs when sperm and egg combine inside an animal's body. | Internal Fertilization |
| Type of fertilization that occurs when sperm and egg combine outside an animal's body. | External Fertilization |
| Fluid-filled ball of cells formed by mitotic cell division of the embryo. | Blasutla |
| Two cell layer sac with an opening at one end that forms from the blastula during embryonic development. | Gastrula |
| Inner layer of cells in the gastrula that develops into digestive organs and the digestive tract lining. | Endoderm |
| Outer layer of cells in the gastrula that develops into nervous tissue and skin. | Ectoderm |
| Layer of cells between the endoderm and the ectoderm that can become muscle tissue and tissue of the circulatory, respiratory, and excretory systems. | Mesoderm |
| Balance or similarity in body structures of organisms. | Symmetry |
| Body plan that can be divided along any plane, through a central axis, into roughly equal halves. | Radial Symmetry |
| Body plan that can be divided into mirror images along only one plane though the central axis | Bilateral Symmetry |
| Head end of an animal with bilateral symmetry. | Anterior |
| Tail end of an animal with bilateral symmetry. | Posterior |
| Tendency to concentrate sensory organs and nervous tissue at an animal's anterior end. | Cephalization |
| Backside of an animal with bilateral symmetry. | Dorsal |
| Underside or belly of an animal with bilateral symmetry | Ventral |
| Fluid-filled body cavity completely surrounded by mesoderm | Coelom |
| Fluid-filled body cavity between the mesoderm and the endoderm | Pseudocoelom |
| Animal with a solid body that lacks a fluid-filled body cavity between eh gut and the body wall. | Acoelomate |
| Coelomate animal whose mouth develops from the opening of the gastrula. | Protostome |
| Coelomate animal whose anus develops from the opening of the gastrula. | Deuterostome |
| Organism that filters small particles from water to get its food. | Filter feeder |
| Organism permanently attached to one place. | Sessile |
| Nematocyst-containing stinging cell on a cnidarian's tentacle. | Cnidocytes |
| Capsule whose threadlike tube contains poison and barbs and is discharged when prey touches a cnidarian. | Nematocyst |
| In Cnidarians, the space surrounded by an inner cell layer, where digestion take place. | Gastrovascular cavity |
| Cnidarian nervous system that conducts impulses to and from all parts of the body. | Nerve net |
| Tube-shaped, sessile body form of cnidarians. | Polyp |
| Umbrella-shaped, free swimming body form of cnidarians. | Medusa |
Created by:
stacycastillo
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