Defending against infection

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1. What is one of the functions of white blood cells?

  • White blood cells ingest and destroy pathogens
  • White blood cells carry oxygen in the bloodstream
  • White blood cells produce antigens that destroy pathogens
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2. What is a 'pathogen'?

  • A disease-causing microorganism
  • A disease
  • A type of disease

3. How do antibiotics work?

  • They can stop bacteria from reproducing
  • They can stop viruses from reproducing
  • They can stop toxins poisoning the tissues of the host

4. Which statement about immunity is correct?

  • Passive immunity involves the body making its own antibodies
  • Passive immunity involves receiving antibodies
  • Active immunity involves receiving antibodies

5. It is important to use antibiotics carefully because:

  • it reduces the spread of resistant strains
  • it reduces the spread of resistant strains
  • antibiotics are very expensive


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