B5.9 Culturing Bacteria And Preventing Growth

Question 1

What are three PRIMARY defences of the body ?

Answer 1

Chemical in your tears kill microbes
Nose produces mucus to trap microbes
Skin covers you whole body. Stops microbes getting in and if you get a cut a scab forms.
EXTRA
White blood cells destroy microbes
Stomach has acid which kills microbes

Question 2

Why do you develop ‘immunity’ to a disease after the fist exposure ?

Answer 2

Your body has the specific antibodies to neutralise the pathogenic bacterium, the antibodies will be rapidly reproduces so the pathogen gets killed before symptoms worsen

Question 3

Why wouldn’t you be immune to malaria after catching a cold?

Answer 3

The antibodies are specific to the antigens they bind to

Question 4

What is your secondary defense ?

Answer 4

The immune system: white blood cells

Question 5

What are 3 ways your blood defends against diseases ?

Answer 5

Phagocyte: phagocytosis, the white blood cells engulfs the pathogen

Lymphocyte: antibodies, bind to the receptors of the pathogen and can either neural use them or call for phagocytes

Lymphocyte : anti toxins, neutralises toxins produced by bacteria