Health definition of health by who

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Environment is classified as internal and external. The internal environment comprises of every tissue, organ and organ systems and their harmonised functioning within the system.

External environment or macro environment consists of those things to which man is exposed after conception. It can be divided into physical, biological and psychological components which can affect the health of man and his susceptibility to illness.

The environmental factors range from housing, water supply, psychological social stress and family structure through social and economic support system, to the organisation of health and social welfare services in the community.

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