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Micro

Helminths

QuestionAnswer
Helminths? Parasitic worms including round worms tape worms and flukes Usually large enough to be seen with the naked eye 1mm to 25 meters in length
Morphology? Multicellular animals equipped with organs and organ systems Reproductive tract is the most developed Primitive digestive excretory nervous and muscular system Thick cuticles for protection Mouth glands for breaking down the host tissue
What's the importance of study ? Impact on global health
Helminth classification? (sexes) Nematodes Cestodes Trematodes
Nematodes? Sexes have different morphologies (One gender per worm)
Cestodes ? Generally hermaphroditic (Male and female sex organs in same worm)
Trematodes? Sexes are separate or HERMAPHRODITIC
Life cycle stages? Eggs Larvae Adults
Eggs? Produced by adult worms often with a productive shell to survive harsh environments
Larvae? Hatch from eggs and may undergo several development stages
Adults? Mature worms that reproduce sexually often within a definitive host
General life cycle? Transmission of an egg or larvae to body of another host Intermediate Definitive and in Transmission and hosts Direct life cycle Indirect life cycle
Intermediate secondary host? The host in which larva development occurs
Definitive Final host? Hosts in which adulthood and mating occur
Direct life cycle? Involves a single host where the helminth matures and reproduces
Indirect life cycle? Requires one or more intermediate hosts before reaching the definitive host
Distribution and importance of parasitic worms? About 50 species of helmets parasizes humans Geographically restricted usually to tropical areas Yearly estimate of World War case number in the billions Conservative estimate of 50 million infections in the US alone
Life cycle of a hookworm? larvae hatch (soil) Migrate to grass "ground itch" scratching, Larvae into skin (blood stream) Lungs coughed up and then "swallowed" Small intestine adulthood feeding Eggs passed in feces Start over
Life cycle of pin worm? Most common in US Kids finger in mouth, Self contamination, cross-contamination, tape test Human ingest pin worm egg go to small intestine female worm to anus, eggs release tape test scratch butt, touch toy, spread
Life cycle of a Ascaris? Most common worm infestation worldwide More common in children than adults Largest helmets to parasitize humans May have 500 to 5000 worms in an infestation Mainly in jejunum and upper ileum Excreted Anally or via vomiting
Life cycle of Trichinella spiralis? Tell me about it
Tapeworm? And humans is in a parasitic infection caused by the tapeworm species Tinea saganida AKA beef tapeworm or Tenia Solemn AKA pork worm THIS IS BY EATING RAW OR UNDERCOOKED BEEF OR PORK
Created by: hw0993422
 

 



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