diseases Archives - Free ZIMSEC & Cambridge Revision Notes

January 2023

Introduction to diseases

By garikaib|2022-09-15T12:38:00+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Parirenyatwa entrance. Image credit financialgazette.co.zw ZIMSEC O Level Combined Science Notes: Introduction to diseases

A disease is an illness
Diseases are caused by pathogens
Pathogens come in the form of:
bacteria, viruses, fungi, protozoa(single celled animals) and small worms
Bacteria can be viewed using a light microscope

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Diseases: Cholera

By garikaib|2022-09-15T12:37:59+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

People fetching contaminated water. Image credit mg.co.za ZIMSEC O Level Combined Science Notes: Diseases: Cholera

I usually spread by contaminated food and/or water
The cholera pathogen is a bacterium called Vibrio cholerae
It is an infectious disease
The pathogen lives and multiplies in the digestive […]

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The body’s defence mechanisms

By garikaib|2022-09-15T12:37:58+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Image credit keyword-suggestions.com ZIMSEC O Level Combined Science Notes: Disease:The body’s defence mechanisms

The body is equipped to deal with and defend itself against diseases and infections
These defends, while inadequate, are effective and essential

Some of the body's defenses. Image credit schoolbag.info

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Immunity and Immunisation

By garikaib|2022-09-15T12:37:57+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Sindiso Marume holding her brother’s health card. Image credit irinnews.org ZIMSEC O Level Combined Science Notes: Disease:Immunity and Immunisation

Immunity-is the ability of the body to resist diseases
There are various types of immunity:

Antigen-is any substance that causes […]

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Diseases:HIV/AIDS

By garikaib|2022-09-15T12:37:56+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Zimbabwe nurse and health worker. Image credit icrc.org ZIMSEC O Level Combined Science Notes: Disease:Immunity and Immunisation

HIV and Its effects

HIV stands for Human Immunodeficiency Virus
It lives in the body fluids including blood, saliva, semen, tears etc
It enters the body in […]

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