4 components in the 1st line of defence Flashcards
1
Q
skin
A
The tough outer waterproof layer protects against chemicals, toxins, etc.
2
Q
Mucous membrane
A
Mucous cells lining tracheal nasal passages etc. trap pathogens so they can be swallowed or expelled.
3
Q
saliva
A
contains enzymes that break down the cell wall of pathogens so they can be destroyed by phagocytosis.
4
Q
Mechanical barriers
A
coughing, sneezing, diarrhoea, expelling pathogens.
