Human Defence System

Question 1

Defence system

Answer 1

Protects the body from disease-causing microorganisms (i.e. pathogens), bacteria, viruses & fungi

Question 2

Infection routes into the body

Answer 2

Ears, Eyes, Mouth, Sharing needles, infected wounds, genitals, bites, contaminated surfaces

Question 3

General defence system

Answer 3

They act against all pathogens

Question 4

What is the general defence system made up of?

Answer 4

It is made up of the body’s natural barriers

Question 5

Different types of barriers

Answer 5

Skin, platelets, stomach acid, hairs in nose, mucous, cilia, ear wax

Question 6

When is the specific defence system needed?

Answer 6

Is needed when the general defence system fails

Question 7

What is the specific defence system made up of?

Answer 7

White blood cells found in the blood

Question 8

Two types of white blood cells?

Answer 8

Phagocytes (engulf pathogens)

Lymphocytes (produce antibodies which kill pathogens)

Question 9

Process of the specific defence system?

Answer 9

1) phagocytes engulf pathogens
2) lymphocytes produce antibodies which attach to the pathogens’ antigens & kill the pathogen
3) some white blood cells produce antitoxins