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31.3 Immune Responses Data Tableruler colored pape 31.3 Immune Responses KEY CONCEPT The immune system has many responses to pathogens and foreign cells. 31.3 Immune Responses Two types of responses # 1 Nonspecific Responses-the same for every pathogen A. Inflammation B. blood vessels become leaky. extracellular C. white blood cells move space toward infection and damaged tissue D. characterized by swelling, redness, and pain capillary wall white blood cell 31.3 Immune Responses • E. Fever-body temperature increases. – Low fevers stimulate white blood cells to mature. – High fevers can cause seizure, brain damage, and even death. 31.3 Immune Responses 2. Specific Responses 1st detect antigens (surface proteins on pathogens Each pathogen has a different antigen. antigens virus 31.3 Immune Responses • Two types of specific immune responses. A. Cellular immunity uses T cells to destroy infected body cells. pathogen antigens antigens T cell receptors memory T cells activated T cells 31.3 Immune Responses . B. Humoral immunity uses B cells to produce antibodies. B cell pathogen antibodies T cell memory B cells activated B cells 31.3 Immune Responses • Both responses produce memory cells. B cell T cell – specialized T and B cells – provide acquired (active) immunity 31.3 Immune Responses The immune system rejects foreign tissues. • Tissue rejection occurs in organ or tissue transplants. • Tissue rejection is the result of an immune response. – immune system detects protein markers on the donor tissue – makes antibodies against the donor’s tissue