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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