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Emma Donovan

on 15 February 2013

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Transcript of Parasitism

Biology 20
By: Emma Donovan PARASITISM PARASITISM The Parasite What is Parasitism? There are two organisms involved in the relationship of parasitism... What is a parasite? Parasitism is the relation between two different kinds of organisms in which one of the organisms’ benefits from the other organism. This often causes injury to the second organism though the damage is usually not fatal. A parasite is the organism that benefits from parasitism. Parasite live within the tissues of the other organism and feeds off its nutrients. Parasites depend on other organisms to survive. The Host What is a host? The host is the organism in which the parasite lives. The nutrients taken by the parasite are at the host's expense. The host is affected negatively by the presence of the parasite but the damage is usually not fatal. HOST A host can be any living thing... Either an animal... Or a plant. Sources: http://student.biology.arizona.edu/honors98/group15/whatisaparasite.htm http://www.biology-online.org/dictionary/Host http://www.sciencedaily.com/articles/p/parasitism.htm Ticks Ticks are very common in Saskatchewan. Live in tall dry grasses. Feed off blood of animals and humans. They bury themselves into the skin of the host and live off its blood. Some Common Parasites Found in Saskatchewan... Gastrointestinal Nematode Parasites Commonly found in cows in Saskatchewan There are three classifications of parasites.... Protozoa Helminths Arthropods http://www.buzzle.com/articles/types-of-parasites.html Are single celled organisms Most are too small to be seen with the naked eye Many are capable of independent movement http://www.mcwdn.org/Animals/PROTOZOA.html Protozoa Arthropods Helminths Are multicellular parasitic worms http://www.globio.org/glossopedia/article.aspx?art_id=15 Most are either 6 legged or 8 legged organisms. http://parasite.org.au/para-site/contents/arthropod-intoduction.html cause infectious disease infect more than one third of the worlds population differ from other parasites because they do not increase in number while within the host. http://www.smccd.net/accounts/case/biol240/helmiinths.pdf They are crustaceans (crabs, lobsters etc.) arachnids and insects. Ex: Tapeworms Eukaryotic: A more complex cell, has a membrane enclosed nucleus. Most reproduction is asexual but some is sexual. Live in moist environments Lice is a Common Parasitic Arthropod Ticks are an example of a parasitic arthropod. Is an example of a helminth parasite In this case the cow would be the host of the parasite
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