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Ch 4 Sci
Ch 4
| Term | Definition |
|---|---|
| homeostasis | The condition in which an organism's internal environment is kept stable in spite of changes in the external environment |
| adaption | An inherited behavior or physical characteristic that helps an organism survive and reproduce in its enviornment |
| vertebrate | an 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 together. |
| radial symmetry | A body plan in which any number of imaginary lines that all pass through a central point to divide the animal into two mirror images |
| bilateral symmetry | A body plan in which a single imaginary line divides the body into left and right sides that are mirror each other. |
| cnidarian | A radially symmetrical invertebrate that uses stinging cells to capture food and defend itself. |
| mollusk | A invertebrate with a soft, unsegmented body; most are protected by a hard outer shell. |
| arthropod | An invertebrate that has an external skeleton, a segmented body, and joined appendages |
| exoskeleton | External skeleton; a tough, 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; structural support system within the inside of an animal |
| chordate | An animal that has a notochord, a nerve chord, and throat pouches at some point in its life. |
| notochord | A flexible rod that supports a chordate's back just below the nerve chord |
| vertebrae | The bones that make up the backbone of an organism. In humans, one of 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 temperature is regulated by the thermal heat the animal produces. |
| fish | A vertebrae 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 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 | An animal whose body temperature is regulated by its internal heat, lays eggs, and has feathers and a four-chambered heart. |
| mammal | An animal whose body temperature is regulated by its internal heat, and that has skin covered with fur or hair and glands the produce milk to feed its young. |
| mammary gland | An organ in female mammals that produces milk for the mammal's 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 her mothers body. |
| placental mammal | A mammal that develops inside its mother's body until its body systems can function independently |
| placenta | An organ in most pregnant mammals, including humans, that links the mother and the developing embryo and allows for the passage of materials between them. |
Created by:
jdreslinski002