Chapter 38:The Human Defence System

Question 1

Pathogens

Answer 1

Disease causing organism

Question 2

Antigen

Answer 2

Any foreign molecule that stimulates the production of antibodies

Question 3

Antibody

Answer 3

Proteins produced by white blood cells in response to an antigen

Question 4

Immunity

Answer 4

Ability to resist disease with antibodies

Question 5

Vaccines

Answer 5

Non disease causing dose of pathogen which stimulates antibody production

Question 6

First Line of Defence

Answer 6

SKIN
Acts as a barrier to prevent pathogens entering

HAIRS IN NOSE
trap bacteria

CILIA
traps bacteria

MUCOUS IN NOSE AND AIRWAYS
traps pathogens

HCL ACID
kills bacteria

Question 7

Second line of defence

Answer 7

MACROPHAGES/PHAGOCYTES
large cells that mices through body
They engulf bacteria

INFLAMMATION
Chemicals called histamines are released which cause redness,swelling