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Chapter 27 all
vocabulary 27
| Question | Answer |
|---|---|
| Blastula | In all animals except sponges, the zygote a (fertilized egg cell) that undergoes cell divisions that form a hollow ball of cells |
| Ectoderm | Cells within the blastula eventually develop into the first distinct layers |
| Endoderm | Cells within the blastula eventually develop into the second distinct layers |
| Mesoderm | Cells within the blastula eventually develop into the third distinct layers |
| Body Plan | A term used to describe an animal’s shape, symmetry, and internal organization |
| Asymmetrical | Irregular in shape, and sometimes their shape depends on where they are growing |
| Radial Symmetry | Have body parts arranged around a central axis, somewhat like the spokes around a bicycle wheel |
| Bilateral Symmetry | A body design in which there are distinct right and left halves |
| Cephalization | Most bilaterally symmetrical ani- mals have evolved an anterior concentration of sensory structures and nerves |
| Coelom | A fluid-filled space found between the body wall and the digestive tract (gut) |
| Acoelomates | This space is lined with cells that come from mesoderm. Animals with no body cavity |
| Pseudocoelomates | Have a body cavity located between the meso- derm and endoderm. |
| Coelomates | A true coelom, a body cavity located entirely within the mesoderm |
| Phylogenetic Tree | How animals are related through evolution |
| Gastrovascular Cavity | A digestive cavity with only one opening |
| Respiration | Take place only across a moist surface, such as the damp skin of an earthworm |
| Gills | A very thin projections of tissue that are rich in blood vessels |
| Open Circulatory System | A heart pumps fluid containing oxygen and nutrients through a series of vessels out into the body cavity |
| Closed Circulatory System | A heart pumps blood through a system of blood vessels |
| Hydrostatic Skeleton | Consists of water that is contained under pressure in a closed cavity, such as a gastrovascular cavity or a coelom |
| Exoskeleton | A rigid external skeleton that encases the body of an animal |
| Endoskeleton | Composed of a hard material, such as bone, embedded within an animal |
| Hermaphrodites | Have both testes and ovaries |
| External Fertilization | The egg is fertilized outside of the female’s body |
| Internal Fertilization | The union of the sperm and egg occurs within the female’s body |
Created by:
matthew.pulley0221
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