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Worms - Part 1

QuestionAnswer
Worms have _____ symmetry. Bilateral
Orientation of an organism includes... Anterior (Head), Posterior (Tail/Bottom/Butt), Dorsal (Back), Ventral (Stomach)
What is the phylum of flatworms? Platyhelminthes
How many species in the phylum Platyhelminthes? 18,500 species
Characteristics of Flatworms.... Dorsoventrally flattened, triploblastic (three cell layers)
Define Diffusion movement from high concentration areas to low concentration areas
Do flatworms have real organs and organ systems? YES
Define Acoelomate no body cavity other than the gut
Do Flatworms have a simple or complex nervous system? simple
Describe the nervous system of flatworms cerebral ganglia with aggregation of nerve cells
How do Flatworms get food? Food enters & exits the same pharyngeal opening
What are the 3 classes of flatworms Turbellaria, Trematode, Cestoda
What is the class that has the largest free-living flatworms? Turbellaria
This class of flatworms have highly branched digestive cavity, voracious hunters, are free living, live in oceans, fresh water, and terrestrial and few are parastic Turbellaria
This class of flatworms are all parasitic, live in animal tissues, have complex life cycle Trematoda
Example of Trematoda Human Liver Fluke
A human ingests a trematoda/Cestoda flatworm via a fish he/she ate. What is the fish and human acting as? intermediate vs. definitive host
Class of flatworms that are known to be Intestinal parasites in vertebrates, who use suckers or hooks to latch on Class Cestoda
How can humans get Cestoda? from eating undercooked meat/poultry
Example of a Cestoda Beef Tapeworm and common tapes in dogs/cats
Created by: pshelly
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