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Biology Chapter 24 V

TermDefinition
Invertebrate Animals without backbones
Exoskeleton Hard or tough outer coverings that provide a framework of support.
Endoskeleton Internal skeletons
Vertebrate With a backbone
Hermaphrodite Produce both eggs and sperm in the same animal body.
Zygote A fertilized egg cell.
Internal fertilization When the sperm and egg combine inside the animals body.
External fertilization When egg and sperm combine outside the animals body.
Blastula The cells continue to divide forming a fluid-filled ball of cells.
Gastrula A two-cell-layer sac with an opening at one end.
Endoderm The inner layer of cells in the gastrula.
Ectoderm The outer layer of cells in the gastrula.
Mesoderm A layer of cells forms between the endoderm and the ectoderm.
Symmetry Describes the similarity or balance among body structures of organisms.
Radial symmetry Can be divided along any plane, through a central axis, into roughly equal halves.
Bilateral symmetry The animal can be divided into mirror image halves only along one plane through the central axis.
Anterior Head end
Posterior Tail end
Cephalization The tendency to concentrate nervous tissue and sensory organs at the anterior end of the animal.
Dorsal Surface, also called the backside.
Ventral Surface, also called the underside or belly.
Coelom One type of fluid-filled cavity.
Pseudocoelom Is a fluid-filled body cavity that develops between the mesoderm and the endoderm rather than developing entirely within the mesoderm as in coelomates.
Acoelomate Animals that do not have a coelom.
Protostome The mouth develops from the first opening in the gastrula.
Deuterostome The anus develops from the first opening in the gastrula.
Filter feeder When an organism such as a sponge gets its food by filtering small particles from water.
Sessile They are attached to and stay in one place.
Cnidocytes Stinging cells.
Nematocyst A capsule that holds a coiled, threadlike tube containing poison and barbs.
Gastrovascular cavity The inner cell layer of cnidarians surrounds a space.
Nerve net Conducts impulses to and from all parts of the body.
Polyp A tube-shaped body and mouth surrounded by tentacles.
Medusa An umbrella-shaped body and tentacles that hang down.
Created by: Alayna Long
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