B5 Flashcards
1
Q
What are pathogens?
A
Microorganisms that enter the body and cause disease. Both plants and animals can be infected
2
Q
What type of disease to pathogens cause?
A
Communicable diseases.
3
Q
What are communicable diseases?
A
Diseases that can spread
4
Q
What forms do pathogens come in?
A
Virus
Bacteria
Protist
Fungi
5
Q
How can pathogens be spread
A
- water
- air
- direct contact
6
Q
What are bacteria ?
A
- very small living cells that can reproduce rapidly inside the body.
- they make you feel ill by producing toxins that damage cells and tissues
7
Q
What are toxins?
A
Poisons
8
Q
What are viruses?
A
- not cells
- very small
- reproduce rapidly
- live inside the cell , replicate themselves using cells machinery to produce copies of themselves . The cell will usually burst releasing all the new virus
- cell damage makes us feel ill
9
Q
What are protists?
A
- eukaryotic
- single celled
- many types
- can be parasites . Parasites live in or on other organisms and can cause them damage . They are often transferred to another organism by a vector.
10
Q
What are fungi?
A
- single celled
- hyphae (thread like structure) can grow and penetrate human skin and surfaces of plants
- hyphae can grow into spores , which can be spread to other plants and animals
11
Q
What is measles?
A
- viral disease
- spread by droplets from a sneeze or cough
- develop red skin rash and shows signs of a fever
- can be very serious and even fatal, if there are complications.
- most people are vaccinated against measles when they’re young.
12
Q
What is HIV?
A
- viral disease
- HIV initially causes a flu like illness .
- unless successfully controlled with antiretroviral drugs the virus attacks the bodys immune system.
- AIDs occurs when the bodys immune system becomes so badly damaged it can no longer deal with other infections or cancers.
- spread by sexual contact or exchange of bodily fluids such as blood of drug users
13
Q
What is tobacco mosaic virus ?
A
- viral disease
- TMV
- widespread plant pathogen affecting many species of plants including tomatoes.
- gives distinctive mosaic pattern of discolouration on the leaves which affects the growth of the plant due to lack of photosynthesis
14
Q
What is salmonella?
A
- bacterial disease
- food poisoning spread by bacteria ingested in food or on food prepared in unhygienic conditions.
- poultry in uk is vaccinated against salmonella to control the spread
- fever , abdominal cramps , vomiting and diarrhoea are causd by bacteria and the toxins.
15
Q
What is gonorrhoea ?
A
- bacterial infection
- sexually transmitted disease
- thick yellow discharge from vagina or penis, also pain when urinating
- caused by bacterium and was treated easily with antibiotic penicillin until resistant strains appeared
- spread by sexual contact
- spread can be controlled with antibiotics or use of a barrier method of contraception such as a condom.