non specific defence systems DEFINITELY IN EXAM

Question 1

what is the job of the non specific defence system

Answer 1

prevents pathogens from entering the human body

Question 2

how is the skin adapted to prevent pathogens from entering

Answer 2

the skin forms a protective layer covering the body
(the outer layer of the skin consists of dead cells which are difficult for pathogens to penetrate and the skin also produces sebum which kills bacteria
when the skin has been broken it scabs over to prevent pathogens from entering

Question 3

how is the nose adapted to prevent pathogens from entering

Answer 3

the nose contains hair and mucus which can trap pathogens before they enter the breathing system

Question 4

how are the lungs adapted to prevent pathogens from entering

Answer 4

the trachea and bronchi are covered with cilia (tiny hairs) which are covered in mucus
the cilia waft the mucus upwards towards the throat where it is swallowed into the stomach

Question 5

how is the stomach adapted to prevent pathogens from entering

Answer 5

the stomach contains hydrochloric acid which kills pathogens