Thursday, July 15, 2010

Chapter 5

16. Complete the parasite chart.

(This is included in the e-mail that was sent to Mr. Bauer)

17. Identify 3 ways in which microbes/parasites move from host to host.

The first way that microbes and/or parasites move from host to host is through a form of transmission that is within close proximity. This includes passage through the air or direct physical contact. Second, parasitic transmission can occur through a “middle man”. This means that the parasite uses an another organism as a mode of transportation to another host, such as mosquitoes and flies. Last is traveling via tainted water or food, as it is with the case of malaria and typhus.


18. For each pathway listed in question #2, explain the relationship of the mode of transmission to the virulence of the intruder.

The first pathway regarding close proximity is one that carries unpleasant, yet bearable circumstances for the host. The host is able to deal with the parasitic consequences because the microbe/parasite depends on the host to remain stable as it continues to evolve under the guiding principals of survival and reproduction. Using an intermediate organism can leave the host at a terrible state, like in the disease of malaria, where an individual is near death if left untreated. The parasite must insure that there is as much of it circulating in the blood as possible, so that once a mosquito is more likely to ingest a parasite. This means that the virulence of the intruder is high and damaging. Finally, transmission through food or water is probably considered the most virulent to the intruder due to its easy accessibility to other potential hosts. As long as there is an efficient delivery system for the parasite (such as unprotected food or water), then the degree of the harm caused by the intruder decreases in importance.

19. What is our advantage in the survive-and-produce race?

Despite the faster-paced evolution of parasites and other sorts of bacteria and microbes due to rapid replication, humans have the advantage of intelligence. The human race has the ability to outsmart harmful microbial evolutionary turns by choosing to shape the environment in way that puts the host (the humans) at an advantage. As the resistance to Penicillin proved to evolve in a speedy manner, humans can use their brain power to avert host manipulation by weakening the microbe so that the relationship between the host and the parasite can be symbiotic.

18 comments:

  1. Hello,

    A great article indeed and a very detailed, realistic and superb analysis, of this issue, very nice write up.

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    Thanks.
    Mark Holland

    ReplyDelete
  2. thanks! i finished my summer hw now!!!

    ReplyDelete
    Replies
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    3. Can you please also send me the parasite chart
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  3. This comment has been removed by the author.

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