Kevin Notes Human Para..09.13

Kevin Notes Human Para..09.13 - Trematode 1. Introduction...

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Trematode 1. Introduction a. Tree of life i. Common ancestor 1. Eubacteria 2. Archea 3. Protista 4. Plantae 5. Animalia 6. Fungi ii. 3,4,5 + 6 are Eukarya b. Classification trematoda Kingdom animalia 1. Phylum platyhelminthes a. Flat + worms b. There is very little fossil records i. Class turbellaria 2. ~3000 spp 3. Free living a. Predators or scavengers 4. E.g. planaria 5. No human parasites in this group 6. Most primitive of platyhelminthes 7. Evolved ~550mya ii. Class monogenea 8. All parasitic 9. Most are ectoparasites of fish 10. One spp in mammals oculotrema hippopotami hippo eye 11. Prevail in crowded conditions, e.g. hatcheris/fish farms 12. Host-specific and site-specific a. Can only infected specific host spp and only on specific spots iii. Class cestoidean a. Tapeworms iv. Class trematoda - ALL PARASITIC a. Subclass aspidogastrea i. Parasites of mollusks, snails ii. At least 2 hosts in life cycle iii. DH and IH, one IH always being some type of mollusk iv. Normally knows as flukes and very common/abundant v. Great economic losses and of high medical importance 2. G a. Bilateral symmetry b. Tripoblastic- 3 embryonic tissue layers i. Ecto,meso&endoderm
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c. Acoelomates i. have no coelom internal fluid filled cavity ii. Body is solid 1. Parenchyma a material that fills the space between the body wall and the gut a. Consists of two cell types i. Fixed cells with fluid filled vacuoles ii. Stem cells b. Reinforced by collagen fibers c. Provides attachment for muscles d. Contains all organs e. Allows passage of O2, nutrients and wastes d. Lack circulatory, skeletal, and respiratory systems e. Possess blind gut i. Mouth and intestine but no anus ii. GET PICTURE OF MOUTH AND CECUM BRANCHING 1. In large trematodes the gut is highly branched allowing transport of food through body f. Respire by diffusion constrains flatworms to be flat g. Osmoregulatory system GET PICTURE i. Protonephridial tubular system closed at one end and open at the other ii. Flame cells are at closed end of system with tufts of fused cilia that beat vigorously 1. each cell opens into terminal tubules that converge into larger collecting tubules that lead posteriorly into common excretory bladder eliminated through excretory pore 2. GET PICTURE WITH FLAME CELLS h. Have a nervous system flatworms among 1 st with clearly defined CNS i. Cerebral ganglion 1. A structure found at anterior end 2. Nerves branch off to anterior especially to oral sucker that surround the mouth ii. 3 pairs of longitudinal nerve cords 1. Supply the posterior end of the body iii. Transverse ring commissures
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This note was uploaded on 01/10/2012 for the course CELL BIO & 328 taught by Professor Keating during the Spring '08 term at Rutgers.

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Kevin Notes Human Para..09.13 - Trematode 1. Introduction...

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