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Chapter 4 lesson 1-5
| homeostasis | Keeping internal body conditions stable |
| adaptation | structures and behaviors that allow animals to perform their functions |
| vertebrate | animals with a backbone |
| invertebrate | animals without a backbone |
| tissue | a group of similar cells that performs 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 line divides the body into left or right sides that are the mirror image of each other |
| cnidarian | a radially symmetrical invertebrate that uses stringing cells to capture the 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 external skeleton, a segmented body, and jointed appendages |
| exoskeleton | external skeleton; a tough, waterproof outer covering that protects, supports, and helps prevent evaporation of water from the body of many invertebrate |
| echinoderm | a radially symmetrical marine invertebrate that has an internal skeleton and a system of fluid filed 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 |
| vertebrae | the bones that make up the backbone of an organism. In humans, one of the 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 temperature is regulated by the internal heat the animal produces. |
| fish | an 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 body temperature is determined by the temperature of its environment, and that lives early in water and its adult life on land |
| reptile | a vertebrate whose 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 lays 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 with hair or fur and glands that produce milk to feed its young |
| mammary gland | an organ in female mammals that produce 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 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 |
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mvu047