Fighting disease

• What do physical and chemical barriers do in the body?

  Stop pathogens from entering the body
• How do memory lymphocytes function in the immune system?

  They remember pathogens for faster response
• What happens if you have a low level of white blood cells?

  You become more susceptible to infection
• What does HIV attack in the body?

  White blood cells
• What effect does HIV have on the immune system?

  It weakens the immune system
• How does a weakened immune system affect pathogen invasion?

  It makes it easier for pathogens to invade
• What is the role of the trachea and bronchi in defending against pathogens?

  They are adapted to prevent pathogen entry
• What are B-lymphocytes?

  They are a type of white blood cell
• What are the main functions of the immune system?

  • Identify pathogens
  • Attack and destroy pathogens
  • Remember past infections for faster response
• How does a low white blood cell count affect health?

  • Increased risk of infections
  • Longer recovery times from illnesses
  • Greater susceptibility to diseases
• What are the consequences of HIV on the immune system?

  • Diminished white blood cell count
  • Increased vulnerability to infections
  • Potential development of AIDS