Communicable diseases

• health is a state of complete physical, mental and social well-being. 
• 2 types of diesaes communicable and non communicable
• • non-communicable, which are not transferred between people or other organisms
• Different types of disease may interact. This can mean that the presence of one disease can lead to a higher chance of developing another disease.
• pathogen is a disease causing organism
• 2 types of barriers

  • chemical barrier lycozyme, hydrochloric acid
  • physical barrier mucus, cilia and skin
• • physical barrier stop pathogens from entering
  • chemical barrier reacts with substances in pathogens to kill them or make them inactive
• skin

  • stops pathogens entering
  • very thick over most of the body
  • when cut it heals itself to prevent infection
• mucus

  • dust and pathogen get trapped in mucus and gets blown out
• ciliated cell

  • cells in nose and tubes in breathing system have cilia
  • the cilia moves dust and pathogens out body
• lysozymes

  • an enzyme secreted by skin that breaks down cell walls or bacteria
  • found in tears, saliva and mucus
• hydrochloric acid(stomach acid)

  • reduces ph of stomach contents to 2
  • many pathogens are destroyed at this activity and only few to survive
• What are the examples of virus


  Ebola(transferred by bodily ) and HIV