Non-specific Human Defence Systems

Question 1

Name the four sites of non-specific human defence systems

Answer 1

1. Skin
2. Nostrils
3. Lungs
4. Stomach

Question 2

What do non-specific defence systems do?

Answer 2

They prevent pathogens from entering inside the body

Question 3

How does the skin prevent pathogens from entering the body?

Answer 3

1. The dead skin cells prevent pathogens from penetrating the skin so they cannot get inside the body
2. The skin secretes sebum which kills bacteria
3. When skin is damaged it scabs over so that pathogens cannot enter

Question 4

What are our nostrils trying to prevent pathogens to enter into?

Answer 4

The breathing system

Question 5

How do our nostrils prevent pathogens from entering the breathing system?

Answer 5

The hairs and mucus in the nostrils trap pathogens and prevent them from entering the breathing system

Question 6

Which two structures in the lungs are part of the non-specific defense system?

Answer 6

1. The trachea
2. The bronchi

Question 7

How do the lungs prevent pathogens from entering the breathing system?

Answer 7

The trachea and bronchi have hair-like cilia in them with mucus on them

The pathogens are trapped in the mucus and then the cilia waft the mucus up to the throat where it is swallowed and taken down to the stomach to be destroyed by the HCL*

*HCL- Hydrochloric acid

Question 8

What is the stomach trying the prevent pathogens from entering into?

Answer 8

The digestive system

Question 9

What are the lungs trying to prevent pathogens from entering into?

Answer 9

The breathing system

Question 10

How does the stomach prevent pathogens from entering inside the body?

Answer 10

There is Hydrochloric acid in the stomach which kills pathogens found in food to prevent pathogens from entering the digestive system