AS AQA Biology - Disease

Revision cards focussing on pathogens, and how lifestyle affects the risk of disease.

These revision cards follow the AQA AS Biology specification.

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  • Created by: creep
  • Created on: 17-04-12 18:01

Pathogens - Entering The Body

Pathogens cause disease.

Types of pathogens include bacteria, fungi, and viruses. 

Pathogens can enter an organism in 3 ways:

  • Gas exchange system - breathing in the pathogens
  • Skin - damaged skin lets pathogens enter
  • Digestive system - eating/drinking substances containing pathogens

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Pathogens - Causing Disease

Pathogens can cause disease in 2 ways:

  • Releasing toxins - these can block the function of nerve cells
  • Damaging cells - by either rupturing them to release their nutrients, using their nutrients until they starve, or replicating inside them and causing them to burst. 
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Lifestyle - Coronary Heart Disease

Lifestyle can increase the risk of developing disease...

The risk of coronary heart disease can be increased by:

  • Having a poor diet - high in fats/salts
  • Smoking
  • Lack of exercise
  • Excessive alcohol intake
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Lifestyle - Cancer

The risk of cancer can be increased by:

  • Excessive exposure to sunlight
  • Excessive alcohol intake - especially liver cancer
  • Smoking especially lung/mouth cancer

Changing your lifestyle decreases the risk of disease.

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Eunice Owusu-Kyereh

This is really good...God Bless you!!!!

Eunice Owusu-Kyereh

This is really good...God Bless you!!!!

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