Thursday, May 04, 2006

26.4 Phylum Nematoda

Phylum Nematoda
*The phylum Nematoda is made up of roundworms with long slender bodies that taper at both ends.
*Roundorms are among several phyla of pseudocoelomates.
*Roundworms have a digestive tract with two openings.
*Most species are free-living; some are parasites.
Ascaris
*The genus Ascaris infects pigs,horses,and humans.
*The eggs enter hosts through contaminated food or water, develope into larvae in the intestines, and can infect the lungs.
*The eggs are spread in the hosts' feces.
Hookworms
*Hookworms are intestinal parasites that feed on blood.
*The eggs produce larvae in soil, and the larvae enter hosts through the feet.
*Hookworms infect about one billion people worldwide.
Trichinella
*The genus Trichinella infects humans and other mammals.
*Adults live in intestines and larvae form cysts in muscles.
*People usually become infected from undercooked pork.
*Infection causes the disease trichinosis.
Other Parasitic Roundworms
*Pinworms, genus Enterobius, are common parasites of humans. They do not cause any serious disease.
*Filarial worms infect many people in tropical countries.
The most dangerous ones infect the lymphatic system and may cause elephantiasis.


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1 Comments:

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