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Unformatted text preview: PLATYHELMINTHS (THE FLATWORMS) 8) When a human eats the crayfish that has not been sufficiently cooked, the metacercariae come out of the cyst in the humans small intestine. It bores out of the intestine and travels to the lungs, enters the bronchioles and develops into an adult. c. Schistosoma (blood flukes)---burrow through the skin of the human host and enter the circulatory system. Adults develop in certain abdominal and pelvic veins. 2. Cestodes (tapeworms)---intestinal parasites. They consist of a head, known as a scolex, which has suckers and sometimes also hooks for attaching to the intestinal wall of the definitive host. Tapeworms have no digestive system, they live by absorbing nutrients through the cuticle from food passing through the digestive tract of the host. The body consists of segments called proglottids. These are continuously produced from the neck region of the scolex. Each proglottid proglottids....
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- Fall '09