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Ch 4
| Term | Definition |
|---|---|
| homeostasis | The condition in which an organism's internal environment is kept stable even when it's external environment changes |
| adaptation | The inherited behavior of physical characteristics that helps the organisms survive and reproduce in their enviornment |
| vertebrate | Animal with spine |
| invertebrate | animal without spine |
| tissue | A group of similar cells grouped to preform a function |
| organ | A body structure that is composed of different tissues that work together |
| radial symetry | A body plan In which any number of imaginary lines that all pass through the central point divide the animal into mirror images |
| bilateral symmetry | A body plan in which a single imaginary line divides the body into to mirror peices |
| cnidarian | A radially symmetrical invertebrate that uses stinging cells to capture food an defend itself |
| mollusk | An organism with a soft unsegmented body |
| arthorpod | An invertebrate that has an external skeleton, a segmented body and a jointed appendages |
| exoskeloton | An external skeleton; a tough Outer covering for the animal that is waterproof |
| endoskeloton | An internal skeleton; structural support for the animal |
| echinoderm | A radially symmetrical marine invertebrate that has an internal skeleton |
| chordate | An animal that has a notochord, and throat pouches in some point of it's life |
| vertebrae | The bones that make up the backbone of an organism |
| endotherm | An organism who's body temp is determined by the organisms internal heat |
| notochord | A flexible rod that is below a chordates nerve cord |
| ectotherm | An organism who's body temp is determined by the environmental temp |
| fish | An organism who's body temp is determined by the environmental temp and lives in the water and has fins |
| reptile | An organism who's body temp is determined by the environmental temp and has scalely skin |
| bird | An organism who's body temp is determined by the organisms internal heat and has wings |
| ammphibian | An organism who's body temp is determined by the environmental temp and that lives early life in the water |
| cartilage | Connective tissue that is more flexible than bone and keeps them from rubbing against each other |
| mammanary gland | An organ the females have in order to produce milk for their young |
| plecetal mammal | A mammal the grows in it's mothers body until it can function itself |
| placenta | An organ in most pregnant mammals including humans that links the mother and the embrio togeather |
| marsupial | A mammal whoose young are born early in the stage of development and develop in a pouh on the mothers body |
| monotreme | A mammal that lays eggs |
Created by:
alefer003