The prevention and treatment of diseases

Question 1

the function of white blood cells

Answer 1

white blood cells destroy the pathogens and they have a memory that the next time the same pathogens enter the body, it will recognise and destroy it before it can harm the body

Question 2

What are the two main types of white blood cells

Answer 2

Phagocytes and Lymphocytes

Question 3

Function of phagocytes

Answer 3

destroys the pathogens before they harm the body

Question 4

Function of lymphocytes

Answer 4

they produce antibodies that destroy the pathogen

Question 5

What do pathogens contain

Answer 5

they contain substances that stimulate the production of antibodies which are called antigens

Question 6

How is natural immunity gained

Answer 6

when the mother’s antibodies are transmitted through the placenta or later in the mothers’ milk

Question 7

How is immunity artificial

Answer 7

when an injection of a mild form of the disease stimulates the antibody production. The vaccine usually contains dead or harmless micro-organism

Question 8

What is an immunity vaccination

Answer 8

causes the production of specific white blood cells in the cells of the body which give better protection against a second attack by the same antigen

Question 9

Passive defence mechanism against plants

Physical barriers

Answer 9

1. hair on the leaf surface prevents the penetration of pathogens