August 2016

Diseases:HIV/AIDS

By |2017-01-17T11:11:33+02:00August 18th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Zimbabwe nurse and health worker. Image credit icrc.org

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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Immunity and Immunisation

By |2017-01-17T11:11:35+02:00August 18th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Sindiso Marume holding her brother's health card. Image credit irinnews.org

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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The body’s defence mechanisms

By |2017-01-17T11:11:35+02:00August 16th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Image credit keyword-suggestions.com

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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Diseases: Cholera

By |2017-01-17T11:11:37+02:00August 16th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

People fetching contaminated water. Image credit mg.co.za

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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Introduction to diseases

By |2017-01-17T11:11:38+02:00August 16th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Parirenyatwa entrance. Image credit financialgazette.co.zw

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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