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Animals
Unit 8 (invertebrates)
| Term | Definition |
|---|---|
| Radial symmetry | The arrangement of body parts in a circle around a central axis |
| Bilateral symmetry | The body of some organisms in where the body can be divided equally along only one plane |
| Spinnerets | The silk spinning organs of arachnids |
| Cephalothorax | The head and trunk region contains eyes anntennae gills and mouth. Found in crustaceans |
| Sessile | Unable to move from a fixed point |
| Gizzard | Used to grind food similar to a second stomach |
| Filter feeders | Animals that eat by straining particles in the water |
| Gastrovascular pouch | A sac-like digestive system |
| Nematocysts | A capsule containing a thin, coiled tubule with a poisones barb at one end |
| Cnidocytes | explosive cell containing one giant secretory organelle or cnida, generally used to capture prey or defend from predators. This defines the Cnidaria phylim |
| Polyp | A tube-shaped body form of a Cnidarian in which the mouth and tentacles face upward |
| Medusa | Umbrella-shaped body form of a Cnidarian in which the mouth and tenticals are on the underside |
| Pharynx | the canal part immediately behind the mouth in invertebrates. |
| Closed Circulatory system | the blood closed at all times within vessels of different size and wall thickness, and does not normally fill body cavities |
| Setae | a stiff hairlike or bristlelike structure, especially in an invertebrate. |
| Clitellum | a raised band encircling the body of oligochaete worms and some leeches, made up of reproductive segments. |
| Chitin | Tough, protective polysaccharide that makes up an Arthropod'a exoskeleton |
| Molting | To shed old exoskeleton to ale way for new growth |
| Open Circulatory system | No true blood vessels, the blood is pumped through and around the tissues |
| Spiracles | A hole in the body of an insects exoskeleton through which air can be taken or released |
| Tracheal tubes | Similar to a throat |
| Compound eyes | an eye consisting of an array of numerous small visual units, as found in insects and crustaceans used to get a bigger and better image |
| Mandible | Appendage that is used to crush and bite food |
| Complete Metamorphosis | Process by which immature organisms change their body for before becoming an adult |
| Crop | used to store undigested food |
| Incomplete metamorphosis | Process by which immature arthropod'a look similar to the adults |
| Mimicry | A technique used to evade predators by copying the look of another, but more dangerous animal of that size |
| Chelicerate | Arthropod that has four antennae and has four pairs of walking legs and a pair of fang-like mouth parts |
| Camouflage | A technique used to blend into ones surroundings |
| Asymmetry | Having no symmetry |
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18verheb
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