Class 12 Biology NCERT Summary Part - I
Class 12 Biology NCERT Summary Part - I
By Dr. Roman Saini
UNIT VIII BIOLOGY IN HUMAN WELFARE
Chapter 8 - Human Health and Disease
Contents
Common Diseases in Humans Immunity AIDS Cancer Drugs and Alcohol Abuse
Diseases in Humans
Diseases can be broadly grouped into Infectious diseases
Easily transmitted from one person to another Very common Some of the infectious diseases like AIDS are fatal Non-infectious - Among non-infectious diseases, cancer is the major cause of death.
Disease causing organisms are called pathogens. All parasites are therefore pathogens as they cause harm to the host by living
in (or on) them. The pathogens can enter our body by various means, multiply and interfere
with normal vital activities, resulting in morphological and functional damage. Pathogens have to adapt to life within the environment of the host. Common pathogens - bacteria, viruses, fungi, protozoans, helminths, etc.
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