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Biology Unit 1 ­ Section 3.1.1
Microorganisms as Pathogens To be considered a pathogen it must:
· Gain entry
· Colonise the tissues
· Resist the defences
· Cause damage to the tissues
Pathogens include bacteria, viruses and fungi
How do microorganisms enter the body
· Many pathogens enter through…

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· Obesity ­ if someone is overweight the risk is higher
· Physical activity ­ more of this lowers risk
© myrevisionnotes Page 1

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· Sunlight ­ more someone is exposed to sunbeds or sunlight (without sun cream) the greater
the risk
Factors that increase the risk of CHD
· If you smoke
· If you have high blood pressure
· If your blood cholesterol is high
· If you're obese
· Diet ­…

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Biology Unit 1 ­ Section 3.1.2
Main parts of the digestive system
(image from
Roles of the major parts of the digestive system
· Mouth ­ starts carbohydrate digestion by adding amylase in saliva to it braking large
carbohydrates down into maltose
· Stomach ­ contains enzymes (proteases) which…


Nasir AL Shamari





Should work now..

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