![]() ![]() B lymphocytes become cells that produce antibodies.Lymphocytes are a type of white blood cell. Some of these directly attack foreign substances in the body, and others work together to help the immune system cells. It also includes chemicals and proteins in the blood, such as antibodies, complement proteins, and interferon. The immune system includes certain types of white blood cells. Immune serum globulin (given for hepatitis exposure) and tetanus antitoxin are examples of passive immunization. It provides immediate protection against an antigen, but does not provide long-lasting protection. Passive immunization may also be due to injection of antiserum, which contains antibodies that are formed by another person or animal. These antibodies disappear between ages 6 and 12 months. Infants have passive immunity because they are born with antibodies that are transferred through the placenta from their mother. Passive immunity is due to antibodies that are produced in a body other than your own. Your immune system builds a defense against that specific antigen. If an antigen gets past these barriers, it is attacked and destroyed by other parts of the immune system.Īcquired immunity is immunity that develops with exposure to various antigens. Examples include the body's complement system and substances called interferon and interleukin-1 (which causes fever). Innate immunity also comes in a protein chemical form, called innate humoral immunity. Mucus, which traps bacteria and small particles.These barriers form the first line of defense in the immune response. Innate immunity involves barriers that keep harmful materials from entering your body. Innate, or nonspecific, immunity is the defense system with which you were born. Your immune system learns to see these antigens as normal and usually does not react against them. These include a group of antigens called HLA antigens. Your body's cells have proteins that are antigens. ![]() The immune system recognizes and destroys, or tries to destroy, substances that contain antigens. Nonliving substances such as toxins, chemicals, drugs, and foreign particles (such as a splinter) can also be antigens. Antigens are substances (usually proteins) on the surface of cells, viruses, fungi, or bacteria. The immune system protects the body from possibly harmful substances by recognizing and responding to antigens. ![]()
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