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Immunity is the ability of an organism to recognize and defend itself against specific pathogens or antigens. “Free from burden”.

The immune System -includes all parts of the body that help in the recognition and destruction of foreign materials. White blood cells, phagocytes and lymphocytes, bone marrow, lymph nodes, tonsils, thymus, and your spleen are all part of the immune system. The immune system produces antibodies or cells that can deactivate pathogens.

Questions ( Click “comments” and type your answers):

  1. Name some types of invaders (pathogens) that might attack body cells?

  • Maryam: Bacteria, virus, fungi,

  • Joyce: Bactria, protozoa, fungi

2. What advantage do pathogens have over humans?

  • Maryam: The pathogens make the body recognize and defend itself against it faster and rapid.

  • Joyce : Helps in the recognition and destruction of pathogens

3. The immune system recognizes what is “self” and tries to protect it; it also recognizes what is “non-self” like pathogens, and tries to destroy it. Based on this, what happens if “non-self” substances penetrate inside the body?

  • Maryam : When non self attack the body the immune system produces either antibodies or cells that can deactivate it or destroy it.

  • Joyce : As soon as the immune system recognizes a non-self body, immediately activates a humoral or cell mediated immune response to try and fight the invader

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