human defences Flashcards
1
Q
whats a physical barrier
A
make it hard for pathogens to enter the body
2
Q
whats a chemical defense
A
are chemicals that are produced to kill or make pathogens
inactive
3
Q
name two chemical defenses
A
lysozyme
hydrochloric acid
4
Q
what are lysozyme (chemical)
A
lysozyme enzyme in tears kills bacteria by digesting their cell walls
also present in saliva and mucus.
5
Q
what is hydrochloric acid? (Chemical)
A
in the stomach kills pathogens in food and drinks
6
Q
Explain two physical barriers in the human body
A
skin is a barrier to pathogens- if it gets damaged blood clots quickly seal cuts and keep microorganisms out.
hairs and mucus in your nose trap particles that could contain pathogen
