Unit 8 New.pptVIP

Unit 8 The Immune System Word Formation macro- 巨大 pro- 原, 前 Group Discussion 1.What do you know about malaria ? 2. Do you know World Malaria Day ? 3. Can you say something about: immune system / immune response/ immunity / immunization ? Malaria 疟疾 ----paludism, tropical disease caused by a parasite Plasmodium(疟原虫) which enters the body after a bite from the female anopheles(按蚊属) mosquito. Malaria is a recurrent disease which produces regular periods of shivering, vomiting, sweating and headaches as the parasites develop in the body; the patient also develops anaemia(贫血). Anopheles albimanus mosquito feeding on a human arm. This mosquito is a vector(媒介) of malaria and mosquito control is a very effective way of reducing the incidence of malaria. Areas of the world where malaria is endemic in the 21st Century (coloured blue). World Malaria Day – a day to make the world care 25 April is a day of unified commemoration of the global effort to provide effective control of malaria around the world. World Malaria Day is not a day for gloom and fear. It is a day of determination and optimism as the global community now has enough evidence that this fight can be won if partners collaborate efficiently on community, local, national, regional and international levels. Immune system ----the organs responsible for immunity. The primary lymphoid organs are the thymus and the bone marrow; the secondary lymphoid organs are the lymph nodes and lymphoid aggregates(聚集 物)(spleen, tonsils, gastrointestinal lymph tissue, and Peyer’s patches). The immune system is the body’s defense against externally generated diseases, such as bacterial and viral infections, as well as internally generated diseases, such as cancer. It consists of a complex network of cells, tissues, and organs and has a sensitive process of checks and balances that together generate an appropriate immune response that