Fighting disease

Question 1

What stops some microorganisms entering your body?

Answer 1

Skin, and hair and mucus (in you respiratory tract)

Question 2

How does your body stops some microorganisms entering your body when you cut yourself?

Answer 2

Your platelets help clot blood quickly to seal wounds

Question 3

Name 3 ways white blood cells fight bacteria and viruses

Answer 3

White blood cells can engulf foreign cells and consume them
They produce antitoxins that counter toxins produced by invading bacteria
Producing antibodies

Question 4

Explain how Producing antibodies works? (4 steps)

Answer 4

1. Every invading cell has unique molecules, called antigens, on its surface
2. When White blood cells meet a foreign antigen they produce proteins, called antibodies, to lock on and kill the invading cells. Antibodies are specific to their antigen
3. Antibodies are rapidly produced and carried around the body to kill all similar bacteria/viruses
4. If a person is infected with the same pathogen again the White blood cells rapidly produce antibodies to kill it, the person is naturally immune