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Chapter 4
Lessons 1-5
| Question | Answer |
|---|---|
| Homeostasis | The condition in which an organism's internal environment is kept stable in the external environment |
| Adaptation | an inherited behavior or physical characteristic that helps an organism survive and reproduce in its environment |
| 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 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 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 segmented body, and joined appendeges |
| 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 body of an animal |
| Chordate | An animal that has a notochord, a nerve cord, and 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 |
| Ecotherm | An animal whose body temperature is determined by the body 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 environment it lives in, 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 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, lay eggs, and has feathers and a four chambered heart |
| Mammal | A vertebrate whose body temperature is regulated by its internal heat, and that has skin covered by hair or fur and glands that 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 their mother's 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:
mjarvis042