8.1 Our Immunity System

Question 1

Infection

Answer 1

An infection occurs when a pathogen enters the body and reaches its target cells.

Question 2

1st Line of Defence

Answer 2

Designed to prevent entry of the pathogen into body, skin, tears, hair, vomit, diarrhea.

Question 3

2nd Line of Defence

Answer 3

General cellular response against pathogens, neutrophils and macrophages engulf pathogens, inflammation which releases histamine, increasing blood flow, bringing more white blood cells.

Question 4

3rd Line of Defence

Answer 4

A specific cellular response, involving lymph nodes that produce white blood cells called lymphocytes, which produce proteins called antibodies.

Question 5

Vaccination

Answer 5

Vaccines are dead/ small part of pathogens, triggering the 3rd line of defence, building immunological memory through antibodies artificially.