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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 the external environment. |
| vertebrate | An animal with a blackstone. |
| adaption | An inherited behavior pr physical characteristic that helps an organism survive and reproduce in its environment. |
| invertebrate | An animal without a blackbone. |
| tissue | A group of similar cells that perform a specific function. |
| organ | A body structure that is composed of different kinds of tissue that work together. |
| radial symmetry | A body pan 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 plan in which a single imaginary line divides that body into let 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. |
| notochord | A flexable rod that supports a chordates back just below the nerve cord. |
| verterbra | The bones that make up the blackbone of an organism. In humans, one of the 26 bones that makeup the blackstone. |
| ectomtherm | An animal whose body temperature is determined by the temperature of its environment. |
| mollusk | The process of shedding an outgrown exoskeleton. |
| echinodern | A rapially symmetrical marine invertebrate that has an internal skeleton and a system of fluid filled tubes |
| endoskeleton | An internal skeleton; structural support system within the body of an animal. |
| chordate | An animal that has a notochord, a nerve cord, and throat pounches at some point in its life. |
| ectotherm | An animal whose body temperature is determined by the temperature of its environment. |
| endotherm | An animal whose body temperature is regulated by the internal heat the animal produces. |
| fish | A vertebrate 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 flexible than bone and that protects the ends of bones and keeps them from rubbing together. |
| amphibian | A vertebrate whose An animal whose body temperature is determined by the temperature of its environment, and that lives its early life in water and its adult life on land. |
| reptile | A vertebrate whose body temperature is determined by the temperature of its environment, that has lungs and scaly skin, and that lays eggs on land. |
| bird | A vertebrate whose body temperature is regulated by its internal heat, let eggs, and has feathers and a four-chambered heart. |
| mammal | A vertebrate whose body temperature is regulated by its internal heat, and that 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 the mammals young. |
| monotreme | A mammal that lays eggs. |
| marsupial | A mammal whose young are born at an early stage of development, and which usually continue to develop in a pouch on their mothers body. |
| placental mammal | A mammal that develops inside its mothers body until its body system can function independently. |
| placenta | An organ in most pregnant mamals, including humans, that links the mother and the developing embryo and allows for the passage of materials between them. |
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