Non - Specific Defense systems

Question 1

Non - specific defence system

Answer 1

The job of the non - specific defense system is to prevent pathogens from entering the human body

Question 2

Skin

Answer 2

The skin forms a protective layer covering the body
The outer layer of the skin contains dead cells and is difficult for pathogens to penetrate
The skin also produces an oily substance called sebum which can kill bacteria
Sometimes the skin gets damaged allowing pathogens to enter the body, to stop this the skin scabs over

Question 3

Nose

Answer 3

The nose contains hairs and mucus
These trap pathogens before entering the breathing system
The trachea and bronchi are covered with tiny hairs called cilia
Cilia are covered in mucus which can trap pathogens
Cilia waft mucus towards the throat where it is swallowed into the stomach

Question 4

Stomach

Answer 4

The stomach contains hydrochloric acid
This kills pathogens before they can make their way further down into the digestive system