defence systems

• What are the two main defense systems of the human body against pathogens?

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

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

  1. Skin
  2. Nose
  3. Trachea and bronchi
  4. Stomach
• How does the skin protect the body from pathogens?

  The skin forms a protective layer and produces sebum that can kill bacteria
• What is sebum and what role does it play in the nonspecific defense system?

  Sebum is an oily substance produced by the skin that can kill bacteria
• What happens when the skin is damaged?

  The skin scabs over to prevent pathogens from entering the body
• Which body openings are not covered by skin and can allow pathogens to enter?

  The nostrils and the mouth
• How does the nose help prevent pathogens from entering the body?

  The nose contains hair and mucus that trap pathogens
• What role do cilia play in the respiratory system?

  Cilia move mucus upwards towards the throat to trap pathogens
• What is the function of hydrochloric acid in the stomach?

  Hydrochloric acid kills pathogens before they can enter the digestive system
• What is an example of a disease caused by a pathogen mentioned in the material?

  Salmonella food poisoning
• What happens even with the nonspecific defense systems in place?

  Pathogens can still enter the human body and cause serious disease
• What will be covered in the next video after discussing the nonspecific defense system?

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

  In the innovation workbook