human defence system

• give areas of defence system in human body

  skin, nose, trachea, stomach and immune system
• describe defence system of skin

  physical barrier and secrete antimicrobials to kill pathogens
• describe defence system of nose

  hairs and mucus to trap pathogens
• describe defence system of trachea

  secrete mucus - trap pathogens

  cilia - waft mucus and pathogens to be swallowed
• describe defences system of stomach

  hydrochloric acid - kill pathogens
• describe defence system of immune system

  destroy pathogens in body through white blood cells
• describe function of white blood cells

  phagocytosis, antibody production and antitoxin production
• describe phagocytosis

  engulf pathogens
• describe antibody production

  bind to antigen of pathogen to act as signal to be destroyed
• describe antitoxin production

  neutralise toxin of pathogen