Intro

Question 1

What is the immune system?

Answer 1

A system of cells and molecules designed to fight infection

Question 2

What barrier do pathogens meet first?

Answer 2

Physical and chemical Barriers

Question 3

2 types of Immune response are:

Answer 3

Innate and adaptive

Question 4

Innate Immune response is: 3

Answer 4

Broadly specific, recognises structures shared by many pathogens - same strength and same way every time

Question 5

Adaptive Immune response is: 3

Answer 5

Highly Ag specific - stronger and faster everytime - immunological memory

Question 6

5 Properties of skin as a barrier:

Answer 6

1. Major line of defence as a protective barrier
2. Low pH
3. Sweat + sebaceous has inhibitory lactic acid and fatty acids
4. Most bacteria fail to survive on skin for too long
5. Intact skin is impermeable to most microorganisms

Question 7

4 Bactericidal body fluids:

Answer 7

Acid in Gastric juice
Spermine and zinc in semen
Lysozyme in tears and saliva and nose
Lactoperoxide in milk

Question 8

5 immune jobs of mucous:

Answer 8

1. Secreted from membranes lining inner surfaces of body
2. Protective - stop bacterial adherence to epithelial cells
3. Traps microbial and other foreign particles
4. Removed by ciliary movement, coughing and sneezing
5. Also has chemicals

Question 9

Microbial antagonism and immunity: 2

Answer 9

Normal flora suppresses grown of pathogenic bacteria and fungi due to competition
If normal flora disturbed - opportunistic infections