Human Defence System

• What type of defenses are features of the human body that stop pathogens from entering?

  Non-specific
• What bodily system possesses both non-specific defenses and white blood cells to destroy pathogens?

  The immune system
• What type of layer does the skin form?

  A protective layer
• What are dead skin cells a component of?

  The skin
• What substance found on the skin kills bacteria?

  Serum
• What does the skin form when it's damaged to prevent microbe entry?

  A scab
• What are the hairs called that cover the trachea and bronchi?

  Cilia
• What do the trachea and bronchi use to trap pathogens?

  Mucus
• What sweeps the trapped pathogens out of the respiratory system?

  Cilia
• What structures in the nose trap particles that could contain pathogens?

  Mucus and hairs
• What acid is contained in the stomach?

  Hydrochloric acid
• What does hydrochloric acid in the stomach kill?

  Pathogens
• What role do white blood cells play in the immune system's defense against pathogens?

  They work to destroy them
• What is the sequence of barriers to infection?

  • Skin: physical barrier, sebum kills bacteria, scabs prevent entry
  • Trachea/Bronchi: Cilia and mucus trap/sweep away pathogens
  • Nose: Mucus and hairs trap particles
  • Stomach: Hydrochloric acid kills pathogens
• What do phagocytes do to Richogers?

  Engulf and destroy them
• What do white wood cells release?

  Antteracias the murereits toxins
• What do antipate cump do?

  Maturnog alls tegeltre
• What process can phagocytes perform?

  Engulfing