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Intro to animals
| Question | Answer |
|---|---|
| homeostasis | the condition in which an organism's internal environment is kept stable in spite of changes in external enviornment |
| adaption | an inherited behavior of physical characteristic that helps an organism survive and reproduce int its evviornment |
| 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 togther |
| radial symmetry | a body plan in which any number of imaginary lines that all pass through a central point divide the animals into two mirror images |
| bilateral symmetry | a body plan in which a single line divides the body into left and right sides that are mirror images of each other |
| cnidarian | a radially symmetric invertebrate that uses stinging cells to capture food and defend itsef |
| mollusk | an invertebrate with a soft unsegmented body most are protected by hard outer shell |
| athropod | an invertebrate that has an external skeleton a segmented body and jointed appendegates |
| exoskeleton | external skeleton a tough waterproof outer covering that protects supports and helps prevent evaporation of water from the body of many invrtebrates |
| echinodrem | a radially symmetrical marine invertebrate that has an internal skeleton and a system of fluid filled tables |
| endoskeleton | an internal skeleton structural support system within a body of an animal |
| chordate | an animal that has a notochord an nerve chord and throat patches at some point in its life |
| notochord | a flexible rod that supports a chordate's back just below the nerve chord |
| vertebra | the bones that makeup the backbone of an organism |
| ectotherm | an animal whose body temp. is determined by the temp. of the environment. |
| endotherm | an animal whose body temp. is regulated by the internal animal it produces |
| fish | a vertebrate whose body temp. is determined by the temp of the environment and that lives in the water with fins |
| cartalage | a connective tissue that is more flexible than bone and that protects the ends of bones from rubbing together |
| amphibian | a vertebrate whose body temp. is determined by the temp. of its enviornment and lives its early life in water and adult on land |
| reptile | a vertebrate whose temp. is determined by the temp. of its enviornment that has lungs and scaly skin and lays eggs on lnd |
| bird | a vertebrate whose body temperature is regulated by its internal heat lays eggs has feathers and has a four chambered heart |
| mammal | a vertebrate whose body temp. is regulated by its internal heat and has fur over its skin and glands that produce milk to feed its young ones |
| 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 of their mother's body |
| placental mammals | a mammal that develops inside its mother's body so it can function properly |
| placenta | an organism in most pregnant mammals including humans the that links the mother and the developing emembro and allows for the passage between them. |
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