Page 1 - 2- Lesson Notes- Health and its failure; Disease and its causes
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SAI International School
Subject - Biology
Chapter-Why do we fall ill?
Subtopic- Health and it’s failure, Disease and its causes
Module -20
Lesson Notes
• Health
According to WHO (World health organization),Health is a state of complete physical,
mental and social wellbeing; and not merely absence of any disease.
• Disease
Any disturbance in the structure or function of any organ or part of body.
It may be caused due to the attack of pathogens (virus, bacteria), lack of nutritious
diet/balanced diet and lack of public health services.
• Personal and community Issues:
Human beings live in societies/ communities, hence the community environment plays an
important role in the health of a person.
Personal health refers to the overall well-being of an individual.
Factors:
⚫ Healthy food
⚫ Mental wellbeing, social harmony.
