Thursday, 11 October 2018

Class 9 - Biology - Why do we fall ill? - Important Definitions (#cbsenotes)(#eduvictors)

Why do we fall ill? - Important Definitions

Class 9 - Biology - Why do we fall ill? - Important Definitions (#cbsenotes)(#eduvictors)

A state of being well enough to function well physically, mentally and socially.

WHO defined health as ‘a state of complete physical, mental and social well-being and not merely the absence of disease or infirmity’"

Lack of feeling of ease or distress due to impairment of health or a condition of abnormal functioning or structural disorder.

Hygiene :
Condition and practices that help to maintain health and prevent the spread of diseases.

A series of events occurring that often point to a disease or condition.

Objective evidence of disease as identified by physicians or doctors.

Acute disease:
Disease lasting for a short period of time.

Chronic disease:
Disease lasting for a long time, even as much as a lifetime.

The intermediate animals causing the spread of infecting agents from a sick person to another potential host.

An organism that is infected with or is fed upon by a parasitic or pathogenic organism.

Any disease-producing agent such as a virus or bacteria or other micro-organisms.

Infectious disease:
A disease where pathogenic microbes are the immediate causes.

Non-infectious diseases:
Diseases where internal causes result in the distressed disorder.

Communicable disease:
A disease capable of being transmitted from an infected person to a healthy person.

The immediate cause of disease:
The cause which immediately kindles a disease into action, when there is a predisposition towards it or the first cause or factors which are directly responsible for a particular disease.

Contributory cause of disease:
A cause or condition whose presence makes it more probable that a particular disorder will occur, but that cause is neither necessary nor sufficient for the occurrence of the disease.

The rapid spread of infectious disease to a large number of people in a given population within a short period of time.

A substance produced by bacteria or fungi that destroys or prevents the growth of infectious or disease causing organisms.

The recruitment process by an active immune system of recruiting many cells to the affected tissue to kill off the disease-causing microbes.

A preparation of a weakened or killed pathogen or of a portion of the pathogen’s structure that upon administration stimulates the immune system to fight against the pathogen, but is incapable of causing severe infection.

Immune System:

It is a body's defence system comprising many biological structures and processes within an organism that protects against disease.

The process of inducing immunity by administering a vaccine to allow the immune system to prevent infection or illness when it subsequently encounters the infectious agent.

It is a hypersensitivity to certain substances, is an extreme reaction of the body’s immune system.

When a pathogen invades our body, it releases toxins into the bloodstream or in tissues. This toxin or foreign protein entering our body is called antigen.

The proteins produced by our immunity system (lymphocytes, WBCs etc.) to neutralise or detoxify antigens are called antibodies.

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