Chapter 3 - Immune System

Question 1

What do antibodies do?

Answer 1

1. Stick to antigens on pathogens to destroy them

2. Remember the antigen so next time the pathogen is fought of more easily

Question 2

Name 2 types of white blood cell? And their jobs?

Answer 2

1. Phagocyte - produces false arms (psuedopoda)

2. Lymphocyte - sends out antibodies

Question 3

Define pathogen?

Answer 3

A microorganism that causes disease

Question 4

What are some physical barriers to pathogens?

Answer 4

1. Mucus (lungs)
2. Cilia (lungs)
3. Acid (stomach)
4. Ear wax (ears)
5. Sebum (skin)
6. Lysosyme (eyes)

Question 5

How do vaccines work?

Answer 5

1. Injects dead or weakened (inactive) pathogens into body
2. White blood cells produce antibodies to fight pathogen
3. White blood cells remember the pathogen and antibodies needed to fight it
4. When/if re-infected there is a rapid response and the antibodies fight the re-infection faster than you feel the symptoms