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chapter 4
| Term | Definition |
|---|---|
| homeostasis | the condition in which an organisms internal environment is kept stable in spite of changes in external environment. |
| adaption | an inherited behavior or physical characteristic that helps an organism survive and reproduce in its environment. |
| vertebrate | and animal with a backbone |
| invertebrate | an animal without a backbone |
| tissue | a group of similar cells that perform a specific function |
| organ | a body structure that is composed of different kinds of tissues that work togther |
| radial symmetry | a body plan in which any number of imaginary lines that all pass through a central point divide the animal into two mirror images |
| bilateral symmetry | a body plain in which a single imagery line divides the body into left and right sides that are mirror images of each other. |
| cnidarian | a radially symmetrical invertebrate that uses stinging cells to capture food and defend itself. |
| mollusk | an invertebrate with a soft, unsegmented body; most are protected by a hard outer shell |
| arthropod | an invertebrate that has an external skeleton a segmentedc body and jointed appendages. |
| exoskeleton | external skeleton a though waterproof outer covering that protects supports and helps prevent evaporation of water from the body of many invertebrates. |
| echinoderm | a radially symmetrical marine invertebrate that has an internal skeleton and a system of fluid filled tubes |
| endoskeleton | an internal skeleton structureless support system within the body of an animal. |
| chordate | an animal that has a notochord a nerve cord and a throat pouches at some point in its life. |
| notochord | a flexible rod that supports a chordate's back just below the nerve cord |
| vertebra | the bones that make up the backbone of an organism. In humans, one of the 26 bones that make up the backbone. |
| ectotherm | an animal whose body temperature is determined by the temperature of its environment. |
| endotherm | an animal whose body tempeture is regulated by the internal heat the animal produces. |
| fish | a vertabrate whose body temperature is determined by the temperature of its environment and that lives in the water and has fins. |
| cartilage | a connective tissue that is more flexable than bone and that protects the end keeps them from rubbing together. |
| amphibian | a vertabrate whose body temperature is determined by the tempeture of its enviorment and lives its early life in water and its adult life on land. |
| reptile | a vertebrate whose temperature is determined by the temperature of its environment, that has lungs and scaly skin, and that lays eggs on land. |
| bird | a vertabrate whose body temperature is regulated by its internal heat, lays eggs , has feathers and a four- chambered heart. |
| mammal | a vertebrate whose body temperature is regulated by its internal heat, and that has skin covered with hair or fur and glands that produce milk to feed its young |
| mammary gland | an organ in female mammals that produces milk for mammal's young |
| monotreme | a mammal that lays eggs |
| marsupial | an inverbreate with a soft, unsegmented body most are protected by a hard outer shell. |
| placental mammal | a mammal that develops inside its mouthers body systems can function independent. |
| placenta | an organ is most pregnant mammals, including humans, that links the mother and the developing embryo and allows for the passage of materials between |
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