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Morfopatologie

    

     Functionarea si reproducerea Hiv poate infecta doar celule care suporta molecula CD4 pe citoplasma, una dintre aceste celule fiind CD4 T-Lymphocytes(o celula alba din sange).Ajutat de lipidele di citoplasma Hiv se prinde si apoi se inglobeaza in celula,apoi ARNul di nucleu se tranforam in ADN.



   The malarial parasite, Plasmodium, is a very small, single-cell blood organism, or 'protozoan'. It lives as a parasite in other organisms, namely man and mosquito. 

   The parasite is the cause of the tropical disease malaria.The Plasmodium parasite is dependent on a single species of mosquito, Anopheles, which is the only species capable of serving as host for it.



What are the different stages of the parasite's life cycle?

This small single-cell organism has three to four different forms. Each form is specialised in living in a certain place.

  • The gametocyte is the form that infects the mosquito and reproduces itself, as if it were both sexes. When the mosquito has sucked blood containing gametocytes, these pass into the salivary glands of the mosquito, where they develop into a new form, the sporozoite. The infection can then move on.
  • The sporozoite can be passed on to man when the mosquito bites, injecting its saliva into the tiny blood vessels. The sporozoite travels with the blood to the liver and enters the liver cells. In the liver some of the sporozoites divide (tachysporozoites) and become thousands of merozoites.
  • The merozoites are released from the liver to the blood where they are taken up by the red blood corpuscles. Some of these turn into ring-formed trophozoites that split again to form schizonts.
  • Schizonts burst the red blood corpuscles at a certain moment, releasing the merozoites. This release coincides with the violent rises in temperature during the attacks seen in malaria.

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