Topic 3 Flashcards
What caused communicable diseases?
Pathogens
How big are bacteria?
Bacteria are very small
What do bacteria do to cells?
They produce toxins that damage cells and tissue
Why are bacteria dangerous?
The reproduce rapidly
How big are viruses?
Viruses are smaller than body cells
Why are viruses dangerous?
The live inside cells and replicate themselves rapidly
How are cells damaged by viruses?
The cells burst and release new viruses
What makes you feel ill when you have a virus?
The cell damage
What type of cells are protists?
They are single called eukaryotes
How are protists transferred?
By a vector
What are some fungi made from?
They are made from hyphae which grows and penetrated skin
What does hyphae produce?
Spores which spread across the skin
How is cholera spread?
It is spread by drinking contaminated water
What type of disease is cholera?
A bacterial disease
How is the influenza virus spread?
Droplets in the air from coughing or sneezing
How is athletes foot spread?
It is a fungus that is spread by touch on shower floor or towels
How is measles spread?
It is spread through droplets in the air
What are some symptoms from measles?
Red skin rash or fever
Why is measles dangerous?
It can lead to pneumonia or brain infection
How can measles be prevented?
Vaccination
How is HIV spread?
Sexual contact, through bodily fluids and shared needles
What are some symptoms of HIV?
Flu-like symptoms
How is HIV treated?
Antiretroviral drugs which stop the virus spreading
Why is HIV dangerous?
The virus attacks immune cells and makes the sufferer more susceptible to disease
What does tobacco mosaic virus do?
It causes a mosaic pattern on the leaves making them discoloured
Why is the tobacco mosaic virus bad for plants?
They can not photosynthesise as well which affects plant growth