Human Health and Diseases, Class 12, Biology - Notes

 Page 1


K C MEENA
PGT BIOLOGY
HUMAN HEALTH AND DISEASE
Page 2


K C MEENA
PGT BIOLOGY
HUMAN HEALTH AND DISEASE
HEALTH
? Defined as a state of complete physical, mental and 
social well- being of a person. 
? Healthy people are efficient at work. This increases 
productivity and economic prosperity. 
? Improper functioning of one or more organs or 
systems of the body is adversely affected, gives rise 
to various signs and symptoms i.e we have disease.
Page 3


K C MEENA
PGT BIOLOGY
HUMAN HEALTH AND DISEASE
HEALTH
? Defined as a state of complete physical, mental and 
social well- being of a person. 
? Healthy people are efficient at work. This increases 
productivity and economic prosperity. 
? Improper functioning of one or more organs or 
systems of the body is adversely affected, gives rise 
to various signs and symptoms i.e we have disease.
FACTORS THAT AFFECT HEALTH 
? Balanced diet 
? Personal hygiene 
? Regular exercise 
? Good habits 
Page 4


K C MEENA
PGT BIOLOGY
HUMAN HEALTH AND DISEASE
HEALTH
? Defined as a state of complete physical, mental and 
social well- being of a person. 
? Healthy people are efficient at work. This increases 
productivity and economic prosperity. 
? Improper functioning of one or more organs or 
systems of the body is adversely affected, gives rise 
to various signs and symptoms i.e we have disease.
FACTORS THAT AFFECT HEALTH 
? Balanced diet 
? Personal hygiene 
? Regular exercise 
? Good habits 
HOW TO ACHIEVE GOOD HEALTH ? 
? Knowledge about diseases, their cause and effect 
Vaccination/ immunisation
Control of vectors 
Proper disposal of waste 
Consumption of clean food and water 
Maintenance of hygiene 
Page 5


K C MEENA
PGT BIOLOGY
HUMAN HEALTH AND DISEASE
HEALTH
? Defined as a state of complete physical, mental and 
social well- being of a person. 
? Healthy people are efficient at work. This increases 
productivity and economic prosperity. 
? Improper functioning of one or more organs or 
systems of the body is adversely affected, gives rise 
to various signs and symptoms i.e we have disease.
FACTORS THAT AFFECT HEALTH 
? Balanced diet 
? Personal hygiene 
? Regular exercise 
? Good habits 
HOW TO ACHIEVE GOOD HEALTH ? 
? Knowledge about diseases, their cause and effect 
Vaccination/ immunisation
Control of vectors 
Proper disposal of waste 
Consumption of clean food and water 
Maintenance of hygiene 
Diseases
? Improper functioning of one or more organs or systems of 
the body is adversely affected, gives rise to various signs and 
symptoms i.e we have disease.
? Diseases which can easily transmit from one person to other 
by any means are called infectious or communicable 
diseases.
? Diseases which can not be transmitted from one person to 
another are called non-infectious or non-
communicable diseases.
? Disease causing organisms are said to be pathogen.