Communicable Diseases

Question 1

See diagram of the structure of bacteria, virus etc.

Answer 1

I will

Question 2

How do pathogens spread?(3)

Answer 2

• Airborne infection
• Direct contact
• Contaminated food/water

Question 3

What is a vector?

Answer 3

A form of direct contact but via a carrier organism. Eg. Mosquito

Question 4

Name forms of direct contact

Answer 4

• Touching indirectly - eg. sharing towels, athletes foot.
• Touching directly - leaves touching, tobacco mosaic virus
• Exchange in bodily fluids - eg. Sexual intercourse, HIV
• Vectors

Question 5

Name barriers of infection(4)

Answer 5

Skin
Stomach
Eyes
Breathing + reproductive system

Question 6

How is skin a barrier to infection.

Answer 6

Skin - tough, dead outer layer acts as barrier to pathogens

     - sebum on surface repels pathogens
     - scabs form quickly if cut

Question 7

How is stomach a barrier to infection?

Answer 7

Stomach - contains hydrochloric acid - kills bacteria in food or swallowed mucus

Question 8

How are eyes a barrier to infection?

Answer 8

• Produce antiseptic tears

- Contains an enzyme that kills a bacteria

Question 9

How are breathing and reprod systems a barrier to infection?

Answer 9

• Produced Mucus which traps pathogens

- contains cilia which moves mucus out of the body