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Study Questions hp - Study Questions Cestodes Introduction...

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Study Questions – Cestodes – Introduction and Adults 1. In which phylum are tapeworms classified? In what two orders are human tapeworms found? Tapeworms are classified in the phylum Platyhelmenthus . Human tapeworms are found in two orders which are cyclophyllidea and pseudophyllidea. 2. What is the scolex? What structures on the scolex help the worm attach to the host intestinal wall? Draw an acetabulate scolex. What cestodes have this type of scolex? What tapeworms have a bothriate scolex? The scolex is the anterior end of the tapeworm. The suckers help the worm to attach to the host intestinal wall. The order cyclophyllidea has acetabulate suckers, which consist of 4 muscular cups. The order pseudophyllidea tapeworms have a bothriate scolex. 3. Where is the neck? What is strobilation? What does Praziquantel do to cestodes? The neck is immediately posterior to the scolex. Strobilation is process by which proglottids form a neck. Proziquantel preferably damages the tegument of the neck because the neck is still unformed. The weak tegument is most vulnerable to drugs. 4. The strobila is made up of ____________. What structures are found in each segment? Are tapeworms monoecious or dioecious? What is protandry? The strobila is made up of proglottids. In each segment or “proglottid”, male and female reproductive organs develop. Tapeworms are monoecious. Protandry is where all the male organs form first. 5. Draw the male reproductive structures. Draw the female reproductive structures. What is the oogenotop? Trace the path of an oocyte as it leaves the ovary, undergoes fertilization, and passes into the uterus. From where do the yolk and shell material come? What eventually happens to the uterus? How does uterine structure differ in Cyclophyllideans and Pseudophyllideans? What are apolysis and anapolysis? In which order does each occur?
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Oogenotop is the entire female reproductive complex. 1.Ovary produces oocytes. 2. Oocytes leave the ovary into the oviduct. The passage is controlled by the oocapt. 3. Next the sperm fertilizes the oocyte in the oviduct. 4. Next the vitalline cells join with the zygote where the vitelline glands producing yoke and shell material. 5. Then the zygote passes into the ootype, where the Mealis glands secrete a thin membrane around the zygote and the vitelline cells, forming an eggshell. 6.Next the zygote passes into the uterus. Eventually the uterus may disintegrate. In the Cyclophyllideans the uterus ends blindly whereas in the Pseudophyllideans the uterus ends in a uterine pore. 7. Finally the eggs get released by either apolysys or anapolysis. Apolysis is when the gravid proglottid breaks off and shed in the feces. Occurs in Cyclophyllideans. In the Pseudoplyllideans the eggs get released through the uterine pore.
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This note was uploaded on 04/03/2008 for the course BIOLOGY 215 taught by Professor Siegel during the Spring '08 term at Rutgers.

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Study Questions hp - Study Questions Cestodes Introduction...

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