Non-Specific Defence Systems

• What should you be able to describe by the end of the video?

  The nonspecific defense systems of the human body
• What are some diseases caused by pathogens?

  Salmonella, HIV, malaria, measles
• What are the two main defense systems against pathogens?

  The nonspecific defense system and the immune system
• What is the primary job of the nonspecific defense system?

  To prevent pathogens from entering the body
• What are the four main parts of the nonspecific defense system?

  1. Skin
  2. Nose
  3. Trachea and bronchi
  4. Stomach
• What does the skin form for the body?

  A protective layer covering the body
• What is the outer layer of the skin made of?

  Dead cells
• What substance does the skin produce to kill bacteria?

  Oily substance called sebum
• What happens when the skin is damaged?

  The skin scabs over to prevent entry
• What do the nostrils and mouth present?

  Openings where pathogens can enter
• What does the nose contain to help defend against pathogens?

  Hair and mucus
• What do hair and mucus in the nose do?

  Trap pathogens before they enter
• What are the tiny hairs in the trachea and bronchi called?

  Cilia
• What do cilia do in the respiratory system?

  Trap pathogens and move mucus upwards
• Where does the mucus go after being moved by cilia?

  It is swallowed into the stomach
• What does the stomach contain to defend against pathogens?

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

  Kills pathogens before they enter the digestive system
• What can still happen despite nonspecific defense systems?

  Pathogens can enter and cause disease
• What will be covered in the next video?

  The immune system
• Where can you find questions on the nonspecific defense system?

  In the innovation workbook
• What is the purpose of the nonspecific defense system?

  To provide immediate defense against pathogens
• How do the skin and stomach work together in the nonspecific defense system?

  Both prevent pathogens from entering the body