disease

Question 1

How does skin act as a non-specific defence

Answer 1

Act as barrier preventing entry of pathogens

Has microorganisms on surface that compete for space with pathogens

Produce sebum which inhibits pathogenic growth

Question 2

How does mucous membranes act as a non-specific defence

Answer 2

Secrete mucus
traps microorganisms and contains lysosomes which destroy bacterial and fungi cell walls

Question 3

What are some expulsive reflexes

Answer 3

Coughing, sneezing – eject pathogen-trapped mucus

Diarrhoea, vomiting – expel contents of the gut