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animals
chapter 4
| Term | Definition |
|---|---|
| homeostasis | The condition in which an organisms internal environment is kept stable in spite of changes in the external environment |
| adaptation | An inherited behavior or physical characteristic that helps an organism survive and reproduce in its environment |
| vertebrae | the bones that make up the backbone of an organism. In humans one of the 26 bones that make up the 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 | body plant 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 the body into left and right sides that mirror each other |
| cnidarian | a radially symmetrical invertebrate that uses stinging cells to capture food and defend it self |
| 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 segmented body and jointed appendages |
| exoskeleton | External skeleton; a tough, water proof 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 ; a structural support system within the body of an animal |
| chordate | An animal that has a notochord, a nerve cord and throat pouches at the same point in its life |
| notochord | A flexible rod that supports a chordates just below the nerve chord |
| vertebrae | An animal with a backbone |
| ectoderm | 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 who's body temperature is determined by the temp of the environment and lives in the water and has fins |
| cartilage | A connective tissue that is more flexible than bone and protects the ends of bones and keeps them from rubbing together |
| amphibian | A vertebrate whose body temperature is determined by the temp of its environment and that lives its early life in water and its adult life on land |
| reptile | a vertebrate whose temp is determined by the temp of its enviroment that has lungs and scaly skin and can |
| bird | A vertebrate 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 fur or hair and glands that produce milk to feed to 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 the mothers body |
| placental mammal | A mammal that develops inside its mothers 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:
mwienclaw002
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