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Worksheet: The Immune System


What is a pathogen?

  • AA doctor who specializes in common communicable diseases
  • BAn illness that affects the respiratory system
  • CA type of medicine that helps treat the flu
  • DA bacterium, virus, or any other microorganism that causes disease


What is the purpose of the immune system?

  • ATo help regulate body temperature
  • BTo help bacteria reproduce (grow)
  • CTo help the body digest food
  • DTo help the body fight infection and disease


Which of these organs helps to prevent germs from entering our body?

  • AThe stomach
  • BThe lungs
  • CThe kidneys
  • DThe skin