Describe the effects of parasites on the host.
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The following pathological conditions may be caused by parasites in their hosts:
(i) Destruction of cells and tissues of the host may take place by movement or feeding activities of the parasite, e.g., Entamoeba histolytica eats the tissue cells of the colon and red blood corpuscles of the host; Plasmodium feeds on liver cells and erythrocytes.
(ii) Parasites may cause enlargement and disorders of lymph glands, spleen and liver, e.g., Leishmania or parasites may cause ulcers in the intestine, liver and brain, e.g., Entamoeba.
(iii) Parasites may secrete poisonous toxins which cause some disease in the host. e.g.plasmodium cause malaria
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(i) Destruction of cells and tissues of the host may take place by movement or feeding activities of the parasite, e.g., Entamoeba histolytica eats the tissue cells of the colon and red blood corpuscles of the host; Plasmodium feeds on liver cells and erythrocytes.
(ii) Parasites may cause enlargement and disorders of lymph glands, spleen and liver, e.g., Leishmania or parasites may cause ulcers in the intestine, liver and brain, e.g., Entamoeba.
(iii) Parasites may secrete poisonous toxins which cause some disease in the host. e.g.plasmodium cause malaria
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