Transcript Immunity B1 1.9

1. How
does your
immune
system
work?
2. How does
vaccination
protect you
against
disease?
3. What are
antigens
and
antibodies?
Immunity
Starter
What are the three ways the white
blood cells protect against disease?
1. How
does your
immune
system
work?
2. How does
vaccination
protect you
against
disease?
3. What are
antigens
and
antibodies?
Immunity
Antigens
• Every cell has proteins on its surface
known as antigens. The antigens on
microorganisms that get into your body
are different to those on your own
cells.
• This means that your immune system
recognises microorganisms as being
foreign.
Immunity
1. How
does your
immune
system
work?
2. How does
vaccination
protect you
against
disease?
ATTACK!!!
3. What are
antigens
and
antibodies?
An invading
Pathogen
One of Your
Body Cells
Antigens
1. How
does your
immune
system
work?
2. How does
vaccination
protect you
against
disease?
3. What are
antigens
and
antibodies?
Immunity
Antibodies
• White blood cells make antibodies
which join onto antigens and help to
destroy the pathogens.
It takes time for me to
make the antibodies to
destroy the pathogen.
Whilst I work hard, the
pathogen is releasing
toxins to make you ill.
1. How
does your
immune
system
work?
2. How does
vaccination
protect you
against
disease?
3. What are
antigens
and
antibodies?
Immunity
Antibodies
• The white blood cells remember the
right antibody to tackle a specific
pathogen, so they can get made again
very quickly if you become re-infected.
• This is how you become immune.
I have a great
memory!
1. How
does your
immune
system
work?
2. How does
vaccination
protect you
against
disease?
3. What are
antigens
and
antibodies?
Immunity
Task 1: Answer the following questions in
full sentences
1. What is an antigen?
2. What is an antibody?
3. Why do you become ill the first time
you encounter a pathogen?
4. Why do you not get ill the second time
you encounter a pathogen?
1. How
does your
immune
system
work?
2. How does
vaccination
protect you
against
disease?
3. What are
antigens
and
antibodies?
Immunity
What is vaccination?
• Also known as immunisation, the
process involves injecting a patient
with a vaccine, so that they gain
immunity against a particular disease
1. How
does your
immune
system
work?
2. How does
vaccination
protect you
against
disease?
3. What are
antigens
and
antibodies?
Immunity
What is a vaccine?
• A vaccine is usually a dead or
weakened form of the disease causing
micro-organism.
1. How
does your
immune
system
work?
2. How does
vaccination
protect you
against
disease?
3. What are
antigens
and
antibodies?
Immunity
How does it work?
This is how vaccines protect you against
dangerous infectious diseases
This is how vaccines protect you against
dangerous infectious diseases
1. How
does your
immune
system
work?
2. How does
vaccination
protect you
against
disease?
3. What are
antigens
and
antibodies?
Immunity
Task 2: Rewrite in the correct order, drawing a
diagram for each one.
(a) White blood cells have a type of memory.
(b)Small amounts of dead or inactive pathogen
are injected into the body.
(c) If you encounter a live version of the
pathogen, your white blood cells rapidly
make antibodies to destroy it.
(d) The antigens in the vaccine stimulate the
white blood cell to make antibodies.
(e) You are therefore immune.
1. How
does your
immune
system
work?
2. How does
vaccination
protect you
against
disease?
3. What are
antigens
and
antibodies?
Immunity
Task 2: Answer
(b)Small amounts of dead or inactive pathogen
are injected into the body.
(d) The antigens in the vaccine stimulate the
white blood cell to make antibodies.
(a) White blood cells have a type of memory.
(c) If you encounter a live version of the
pathogen, your white blood cells rapidly
make antibodies to destroy it.
(e) You are therefore immune.
1. How
does your
immune
system
work?
2. How does
vaccination
protect you
against
disease?
3. What are
antigens
and
antibodies?
Immunity
Plenary
• Create a 3x3 bingo grid.
• Fill each square with one of these key
words:
Antigen, Antibody, White Blood Cell,
Pathogen, Vaccine, Immunisation,
Toxin, Bacteria, Virus