Pearson 9 Science Ch 8 Disease Answers

Pearson 9 Science Ch 8 Disease Answers

Chapter 8 Disease

Unit 8.1

1 Pathogens

2 Immune system

3 Any two of: whooping cough, tetanus, diphtheria, impetigo (school sores),

pneumococcal and meningococcal disease and typhoid fever

4 To kill bacteria

5 Whooping cough, tetanus, diphtheria

6 The bacterium Helicobacter pylori

7 Anything that prevents the body from functioning normally.

8 Water is lost from the body when you vomit or have diarrhoea.

9 Either inactivate the poison produced by bacteria or use dead bacterial cells.

10 Vaccination causes your body to react in the same way as it would to the pathogen.

At a later stage, if the pathogen is met, antibodies can be made quickly by your

body and the pathogen destroyed before you get sick.

11 It means that you will not become ill if the pathogen enters your body.

12 Salmonella enteritidis bacteria are naturally occurring bacteria. If the bacteria get

into food you eat, they can cause gastroenteritis. Washing your hands gets rid of

the bacteria.

13 They thought that the acid in the stomach would kill the bacteria.

14 a Infectious diseases are diseases that can be spread from one person to another.

A contagious disease is an infectious disease that is spread very easily.

b Antibiotics kill the bacteria that are making you sick. Vaccination prevents you

from getting sick.

15 If you are exposed to a pathogen, it can make you sick. Your body responds

eventually by making antibodies. You recover and are then immune to that

pathogen. Having a vaccination causes your body to respond in the same way but

you do not have to get sick to develop immunity.

16 These people are not being reasonable. The diseases are rare. They have not

been eradicated. They are only rare because they are controlled by immunisation.

The recommendation would be to get immunised. In this way they are protected

from getting the disease themselves. They are also protecting...

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