Immune System

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How does the immune system react to pathogens? It fights off the pathogen by Leukocytes also known as white blood cells. When a pathogen enters the body the immune system becomes alert to it and sends out sends out the Phagocytes (a type of Leukocytes) which engulf the pathogens. If the body has a weak immune system, the pathogens eventually overtake the body which can result in a disease. How do the different pieces of the immune system work together? The bone marrow, the lymph nodes, the spleen, and the thymus are the organs that are part of the immune system, all of which work together to produce the different types of white blood cells which keep you alive. How do immunizations work? Immunizations work by keeping a person safe from contracting a disease “later.” If a person were immunized against a disease, exposure to the disease would immediately set up an immune response, thus protecting the person from actually getting the disease. What is the difference between primary and secondary immune response? Primary immune response refers to the first encounter of your immune system with a virus or bacteria. When this happens, naive T. A secondary immune response refers to a re-encounter of the same virus/bacteria against which you have memory T cells and B cells. Since the memory cells have seen the bug before, they can respond very rapidly and robustly, preventing you from feeling sick. Cells and B cells are activated and form memory cells. This process takes a week or so, which allows you to get sick and not feel well, but these cells eventually clear the pathogen from your body. What the difference between active and passive immunity is in regards to immunization? Active immunity is a form of immunity that develops after a primary immune response which is a response to exposure to a live pathogen and development of symptoms. The cells produce the antibodies themselves. Passive immunity is a form of immunity in which a person's cells do not produce the...
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