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PARASITES

PARASITES. By:afnan bakhsh. Parasitology : the study of parasites. Parasite: it is organism living in or on other organism. Parasites can be divided to: Protozoa. unicellular Helminthes. Multicellular Arthropods. Multicellular. Protozoa:.

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PARASITES

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  1. PARASITES By:afnanbakhsh

  2. Parasitology: the study of parasites. • Parasite: it is organism living in or on other organism.

  3. Parasites can be divided to: • Protozoa. unicellular • Helminthes. Multicellular • Arthropods. Multicellular

  4. Protozoa: • Single cell (unicellular) eukaryotes. • They can live as free organisms or parasites. • They transmitted by: • Blood sucking insect bites. • Accidental ingestion. • It have two stages: • Cyst: dormant stage outside the body. • Trophozoite: active stage inside the body.

  5. Protozoa are classified into four classes according to their motility: 1-ameobsas 2-ciliates 3-flagellates 4-sporozoa

  6. Amoebas: move by pseudo pods (Ex:Entamoebahistolotica). Cyst Trophozoite

  7. Ciliates: move by cilia (Ex:Balantidium coli). Cyst Trophozoite

  8. Flagellates: move by flagella (Ex:Trypanosoma).

  9. Sporozoa: intracellular parasite, doesn’t move it transmit through the blood (Ex:Plasmodium). Blood parasite.

  10. Helminthes (worms): • Multicellular eukaryotic organisms. • - It has two stages: • Larval stage (egg): measure 100-200 Mm. • Adult worms: measure from cm to meters.

  11. Adult worms: measure from cm to meters. • They can classify into: • Nematode: Ex. Ascaris. • Trematode: Ex. Schistosoma. • Cestode: Ex. Taenia.

  12. ascaris

  13. Schistosoma.

  14. taenia

  15. Arthropods (insects): • Ex: mosquitoes, bee, flea and flies. • Harmful effects of them: • Food poisoning. • Discomfort. • Cause diseases and transmit diseases. • Damage of crops.

  16. Benefit of arthropods: • Bees produce honey. • Fertilization of plants and flowers.

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