Barriers preventing pathogenic infections (1st line of defence)

Question 1

microbiota

Answer 1

prevent growth of microorganisms that could be pathogenic

Question 2

chemical

Answer 2

inhibit pathogen growth and development and/ or destroy pathogens

Question 3

physical

Answer 3

prevent pathogens entry

Question 4

physical- animals

Answer 4

• intact skin
• mucous secretions

Question 5

chemical- animals

Answer 5

• stomach acid
• lysozymes in tears and saliva destroy bacterial cell walls

Question 6

microbiota- animals

Answer 6

• presence of bacteria on skin

Question 7

physical - plant

Answer 7

• thick bark
• waxy cuticles on leaves
• closing stomata