Term
Three germ layers of Phylum Platyhelminthes
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Definition
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Term
| What does acoelomate mean? |
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Definition
| No cavity within mesoderm |
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Term
| Describe a "sac plan" body |
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Definition
- One opening to gut serves as mouth and anus
- Time partitioning of gut function
- Intracellular digestion
- Branched gut
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Term
| What does a muscular pharynx do in a flatworm? |
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Definition
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Term
| Flatworms are the simplest (& possibly earliest) animals that are: |
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Definition
- Motile- move through their environment
- Bilaterally symmetrical- streamlined to reduce friction and drag
- Cephalized- have concentration of nervous tissue ("brain') and sense organs at leading end
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Term
| What are the three classes of Phylum Platyhelminthes? |
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Definition
- Class Planarians
- Class Flukes
- Class Tapeworms
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Term
| What are the types of Parasitic Flatworms? |
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Definition
- Class Flukes
- Class Tapeworms
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Term
| Name the two major characteristics of Parasitic Flatworms |
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Definition
- Complex life cycles: free-living and parasitic stages. intermediate hosts
- Enormous numbers of offspring: 105 eggs per day x 1000 days = 100,000,000 eggs per female
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Term
| Name the major characteristics of Class Flukes |
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Definition
- Obligate parasites
- Anterior sucker
- Snail required as alternate host
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Term
| Name the body parts of Class Tapeworms |
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Definition
- Scolex
- Proglottids
- Lack of gut- instead, absorbs nutrient molecules from host's intestine
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