Lesson 6 Science and Health
Health and illness: to be healthy our body must be functioning well. When our body stops functioning correctly or we become out of balance we feel ill because of the symptoms (fever, pain, coughing…) we show. There are two kind of illnesses:
a) Infectious illnesses: Transmitted by infectious agents (Microscopic living things such as bacterias and Viruses) that enter our body through the air or touching our mouth, eyes….
These infectious illneses can be contagious (flu or cold) and non contagious (Tetanus or salmonellosis are caused by bacterias)
b) Non- Infectious illnesses: by a variety of causes.
- Traumas: caused by accidents (cuts, burns…).
- Poisoning: When a toxic substance enters your body.
- Malnutrition and Obesity caused by an inadequate nutrition.
- Tumors and cancer: caused by radiation, viruses or abnormally grown of cells.
- Cardiovascular diseases: caused by stress or unhealthy lifestyles.
- Allergies: an exaggerated reaction to a substance
- Mental illnesses such as depression.
