IMMUNE SYSTEM

• Provides a barrier against pathogens (bacteria, fungi, parasite, virus)- disease causing agents

  Defends the body against pathogens

  IMMUNE SYSTEM
• First line of defense (skin)


  barrier
• Second line of defense (WBC- phagocytosis)


  inflammatory response
• Third line of defense (antibodies and antigens)
• Type of lymphocyte (white blood cell) that produces chemicals called antibodies to destroy each kind of pathogen

  b cell
• Identify pathogens and tell them apart using the pathogens antigens (marker molecules)

  t cells
• Occurs when our own immune system is responsible for protecting us from a pathogen

  active immunity
• Occurs when we are protected from a pathogen by immunity gained from someone else

  passive immunity