Causes of Disease - Unit 1 AQA Biology
Biology Unit 1 Chapter 1 from the Nelson Thornes AS Biology textbook - summary of topics
- Created by: hellooooooooooooo
- Created on: 17-03-14 15:46
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- Causes of Disease
- Pathogens
- disease = a malfunction of the body or mind which has an adverse effect on good health
- for microorganisms to be classed as pathogens, they must:
- gain entry to the hose
- colonise the tissues of the host
- resist the defences of the host
- cause damage to the host tissues
- bacteria
- fungi
- viruses
- damaging host tissues
- producing toxins
- pathogens enter the body through:
- gas-exchange system
- digestive system
- organism that causes disease
- Data and Disease
- correlation
- a change in one of two variables is reflected by a change in the other variable
- cause
- looking critically at data
- right factor measured? right questions asked?
- how were data gathered? were methods reliable? was the right apparatus used?
- do those collecting the data have a vested interestest in the outcome of the research?
- has the study been repeated? are the results and conclusions the same from other people?
- are there still unanswered questions?
- correlation
- Lifestyle and Health
- risk = the measure of the probability that damage to health will occur as a result of a given hazard
- health risk needs a time scale
- Cancer
- risk factors:
- smoking
- diet
- obesity
- physical activity
- sunlight
- risk factors:
- Coronary heart disease
- risk factors:
- smoking
- high blood pressure
- blood cholesterol levels
- obesity
- diet
- physical activity
- risk factors:
- reduce the risk of CHD oand cancer - give up smoking/more exercise etc.
- interpreting graphs
- Pathogens
- mucous layer; production of enzymes; production of stomach acid
- digestive system
- gas-exchange system
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