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Immune System notes Immune System: protects our bodies from disease causing agents (antigen). This is done by our cells, tissues and organs working together. The IMMUNE SYSTEM protects us from, these 5 primary disease causing agents: 1. bacteria – single celled 2. microbes – microscopic organisms 3. viruses – get into cells and multiply 4. toxins – poisons, such as a venom 5. parasites – feed off of another organism Antigen- any organism that invades our body, see 5 disease causing agents above. Skin- our first line of defense against invading germs. Mucus in our nose, mouth & eyes act as a barrier to protect body by trapping disease causing organisms. Enzymes in your mouth & Tears in your eyes helps to breakdown viruses and bacteria. Lymphatic system- works with the immune system to protect the body from disease causing organisms. Lymph is a clear fluid that carries white blood cells which is filtered through the lymph nodes. White Blood Cells (leukocytes)- protects our body from disease causing agents. 2 types: Lymphocytes- identifies any antigens B cells- produce antibodies (made in bone marrow) T cells- these destroy and trigger phagocytes to begin working (made by thymus) B cells latch on and T cells destroy the disease causing agent Vaccination (vaccine)- a dead or weakened form of a disease, introduced into your body to help your body recognize, destroy and build up immunity to this disease (ex: flu shot) Allergy is a reaction by a person’s immune system against a normally harmless disease.