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Worms for extra credit
 

Worms for extra credit

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    Worms for extra credit Worms for extra credit Document Transcript

    • All About Worms for Extra Credit Due March 5th Invertebrates are animals that do not have a hard backbone (vertebrae). Theyinclude a wide variety of animals, such as corals, worms, insects and molluscs.This section will concentrate on worms, starting with parasitic flatworms.A) Web site name: Centers for Disease Control Web URL: http://www.cdc.gov/ncidod/dpd/parasites/schistosomiasis/factsht_schistosomiasis.htmRead “What is Schistosomiasis?”1) What causes Schistosomiasis? _____________________________________________________________2) How many people are infected with Schistosoma? _____________________3) How does fresh water become contaminated by Schistosoma eggs? _____________________________________________________________4) Why are snails important in spreading the disease? ____________________ _____________________________________________________________5) What are the symptoms of Schistosomiasis? _________________________ _____________________________________________________________6) What four parts of the body can be damaged by repeated infections over many years? ___________________________________________________7) How long should you wait after your last exposure before a blood sample is taken? _____________________________8) List three parts of the world where Schistosomiasis occurs: _____________________________________________________________9) Why do you think that swimming in chlorinated pools is “generally thought to be safe”? ___________________________________________________ _____________________________________________________________
    • 10) How long should you boil water to make it safe to drink? _____________________________________________________________11) Why is water that has been stored for 48 hours safe for showering? _____________________________________________________________ _____________________________________________________________Not all worms are harmful. Earthworms are very beneficial, as they increaseaeration of soil and so improve the yield of crops. The next article deals withanother possible benefit of earthworms.B) Web site name: BBC News Web URL: http://news.bbc.co.uk/2/hi/science/nature/7611522.stmRead “Earthworms to aid soil cleanup”12) Give examples of industrial activities that contaminated soil. _____________________________________________________________ _____________________________________________________________13) Which metals are in these soils? ___________________________________14) Why was the “Diamond Light Source” important in the study: _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________15). Explain how earthworms can help in removing toxins from the soil. _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________
    • C) Web site name: Science in Africa Web URL: http://www.scienceinafrica.co.za/2001/september/leech2.htmRead “An African leech for use in microsurgery in Africa!”16). What problem was caused by the popularity of medicinal leeches? _____________________________________________________________ _____________________________________________________________17). In the past, how many leeches were used on a patient at the same time? _______________18). Explain why leeches are now used around skin flaps and grafts. _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________19). Which anticoagulant do leeches introduce into a bite? __________________20). What problem do surgeons have in South Africa? _____________________________________________________________ _____________________________________________________________21). What is the natural host of Aliolimnatis buntonenevis? _________________22). What are two problems with using these leeches, and how could they be solved? _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________
    • D) Web site name: Centers for Disease Control Web URL: http://www.cdc.gov/ncidod/dpd/parasites/lymphaticfilariasis/factsht_lymphatic_filar.htm This web site gives information about “Lymphatic filariasis” which is also called “Elephantiasis”, a disease caused by the nematode worm Wuchereria.23) Where in the human body do the worms live? _______________________24) Which parts of the world have lymphatic filariasis? _____________________________________________________________ _____________________________________________________________25) How long does the adult worm live? ________________________________26) Why do tourists have a very low risk? _____________________________________________________________27) What are the main symptoms of the disease? _____________________________________________________________ _____________________________________________________________28) What does the treatment do? ___________________________________ _____________________________________________________________ _____________________________________________________________ E) Web site name: BBC news Web URL: http://news.bbc.co.uk/2/hi/health/7754644.stm Read “Antioxidants cannot slow ageing”29) What worms were used in this study? _______________________________30) Explain the theory of “oxidative stress”. _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________
    • 31) Give two reasons why these tiny worms are a “useful tool” to scientists. _____________________________________________________________ _____________________________________________________________ _____________________________________________________________32) What experiment was done using the worms, and what was the result? _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________33) According to Dr Gems, what is important for reducing the risk of many “old age” diseases? _____________________________________________________________ _____________________________________________________________ _____________________________________________________________34) Do you agree with the statements by Pamela Mason? Explain why. _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________