Sunday, 26 November 2017

UNIT 3: HEALTH AND ILLNESS

3.1. Diseases and illnesses. 

We are going to learn about types of diseases:
- Infectious diseases (caused by pathogens).
- Non-infectious diseases.

Before starting -> Make a list of the things you do to prevent an illness.


INFECTIOUS DISEASES such as common colds, are caused by harmful organisms called pathogens entering our body.
The most common pathogens are bacteria and viruses. Other microorganisms, such as some kinds of fungi and protists, can also cause diseases.


Bacterias
Viruses

NON-INFECTIOUS DISEASES such as diabetes, are not caused by organisms. They are caused by different factors and cannot be spread from person to person.
A healthy lifestyle helps prevent diseases. This includes a healthy diet, exercise, regular check-ups, and saying no to drugs and alcohol and an excessive use of video games.


The immune system is a network of cells, tissues, and organs that work together to defend the body against attacks by “foreign” invaders. These are primarily microbes—tiny organisms such as bacteria, parasites, and fungi that can cause infections.


Most common infectious diseases


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