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28 Cards in this Set
- Front
- Back
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Heterotroph |
organism that obtains food by eating other organisms or by eating or absorbing their byproducts and that cannot synthesize organic compounds from inorganic materials |
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invertebrate |
an animal that does not have a backbone |
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vertebrate |
animal that has a backbone; includes mammals, birds, reptiles, amphibians, and fish |
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Hydrostatic skeleton |
cavity that is filled with water and that has a support function |
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Exoskeleton |
hard, external, supporting structure that developed from the ectoderm |
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Endoskeleton |
an internal skeleton made of bone and cartilage |
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Gastrovascular cavity |
a cavity that serves both digestive and circulatory purposes in some animals |
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cephalization |
concentration of nerve tissue and sensory organs at the anterior end of an organism |
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Cleavage |
series of cell divisions that occur immediately after an egg is fertilized |
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Blastula |
the stage of an embryo before gastrulation |
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gastrulation |
transformation of the blastula into the gastrula or the formation of the embryonic germ layers |
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Protostone |
organism whose embryonic blastospore develops into the mouth |
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deuterostome |
an animal whose mouth does not derive from the blastopore |
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coelom |
body cavity that contains the internal organs |
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Notochord |
rod-shaped supporting axis found in the dorsal part of the embryos of all chordates, including vertebrates |
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amniotic egg |
type of egg that is produced by reptiles, birds, and egg laying mammals and that contains a large amount of yolk |
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Therapsid
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Member of the extinct order of mammal-like reptiles that likely gave rise to mammals
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Choanocyte
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Any of the flagellate cells that line the cavities of a sponge
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Amoebocyte
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In sponges and other invertebrates, an amoeba-like cell that moves through the body fluids, removes wastes, and participates in other processes
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Spicule
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Needle of silica or calcium carbonate in the skeleton of some sponges
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Spongin
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Fibrous protein that contains sulfur and makes up the skeleton of some sponges
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Medusa
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Free-swimming, jellyfish-like, and often embrella-shaped sexual stage in the life cycle of a cnidarian
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Polyp
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Form of a cnidarian that has a cylindrical, hollow body and that is usually attached to a rock or to another object
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Cnidocyte
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Stinging cell of a cnidarian
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Nematocyst
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Stinging organelle that is used to inject a toxin into prey
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Planula
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The free-swimming, ciliates larva of a cnidarian
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Proglottid
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One of the many body sections of a tapeworm; contains reproductive organs
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Pseudocoelom
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Type of body cavity that forms between the mesoderm and the endoderm in rotifers and roundworms
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