The Immune System

• What is the main function of the immune system?

  The immune system destroys pathogens and protects against future infections.
• What are the two main functions of the immune system?

  • Destroys pathogens
  • Protects against future infections from the same pathogen
• How do pathogens enter the body?

  Through damaged skin or other openings.
• What do bacteria release that can make us feel unwell?

  Bacteria can release chemicals called toxins.
• What are the three functions of white blood cells?

  Ingest and destroy pathogens, produce antibodies, and produce antitoxins.
• How do white blood cells destroy pathogens?

  • Ingest and destroy pathogens through phagocytosis
  • Produce antibodies that stick to pathogens
  • Produce antitoxins that neutralize toxins
• What is phagocytosis?

  Phagocytosis is the process where white blood cells ingest and destroy pathogens.
• What are antibodies?

  Antibodies are protein molecules produced by white blood cells.
• How do antibodies function in the immune response?

  They stick to pathogens and trigger their destruction.
• Why are antibodies considered specific?

  Because they target specific pathogens only.
• How long can antibodies remain in the blood?

  Antibodies can remain in the blood for a long time.
• What are antitoxins?

  Antitoxins are chemicals produced by white blood cells that neutralize toxins.
• How do antitoxins protect the body?

  They prevent toxins from damaging cells.