Biology- B3 Part B

1. 3 ways of killing pathogens: ... -Every pathogen has antibodies on its surface and white blood cells produce proteins called antibodies. Antibodies lock on to invading cells and are destroyed by other white blood cells (9, 10)
6. The ... system: Skin acts as a barrier to pathogens, Hair and mucus in your nose trap particles that could contain pathogens. Trachea and Bronchi secrete mucus to trap pathogens which are also lined with cilia sending mucus to the stomach (7)
7. A Protist Disease. -Come from mosquitoes, injects into another animal when feeding. Causes repeated episodes of fever, can be fatal. Spread reduced by stopping mosquitoes breeding so use insecticides or mosquito nets to protect (7)

2. 3 ways of killing pathogens: ... -Counteract toxins produced by invading bacteria (7, 10)
3. The most important part of the immune system is ... (5, 5, 5)
4. A Bacterial Disease. -A sexually transmitted disease (STD) which is passed on by sexual contact. People will get pain when they urinate, a green or yellow discharge. Originally treated with the antibiotic, penicillin, but bacteria are resistant to it (10)
5. Fighting Disease- ... involve injecting harmless pathogens with antigens. body responds by producing antibodies rapidly which attacks the pathogen. If real pathogens appear, the white blood cells produce antibodies rapidly and pathogen is killed (12)
8. 4 ways to ... or ... disease are: Being Hygenic, Destroying Vectors, Isolating Infected Individuals, Vaccinations (6, 7)
9. 3 ways of killing pathogens: ... -Engulf foreign cells and digest them- known as phagacytosis (7, 9)
10. A Bacterial Disease. -Causes food poisoning, produces toxins. Symptoms include fever, stomach cramps, vomiting and diarrhoea. Can get it by eating contaminated food. In UK, poultry is given vaccinations to prevent spread (10)

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