Biology · OCR Paper 2
Health and Communicable Disease
What health and disease are, the different types of disease and how they interact, how communicable diseases are caused by pathogens and spread in animals and plants, how the spread can be reduced or prevented and how infections are detected, and examples of infections including HIV/AIDS, tobacco mosaic virus, barley powdery mildew, crown gall and sexually transmitted infections. Matches OCR B6.3a to B6.3f. Every lesson is for both Combined Science and separate Biology.
Lessons
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1
Health and Disease
Being healthy is more than not being ill. This lesson is for both Combined Science and separate Biology. It covers what health means, the different types of…
10 terms -
2
How Communicable Diseases Spread
A cold in one student can become a cold in a whole class, and a fungus on one leaf can spread across a field. This lesson is for both Combined Science and…
10 terms -
Knowledge organiser
The whole chapter on a page or two of A4 — to revise from on screen or print.
Key terms in this chapter
All 20, gathered from every lesson.
- Health
- A state of physical and mental wellbeing, not only the absence of disease.
- Disease
- A condition that stops part of the body or mind from working properly.
- Pathogen
- A microorganism that causes disease.
- Communicable disease
- A disease caused by a pathogen that can be passed from one organism to another.
- Non-communicable disease
- A disease that is not caused by a pathogen and cannot be passed from one person to another.
- Inherited disorder
- A disease caused by a faulty allele that is passed from parents to their children.
- Deficiency disease
- A disease caused by a lack of a nutrient, such as scurvy from too little vitamin C.
- Mental illness
- A disease that affects the mind and a person's thoughts, feelings and behaviour, such as depression.
- Immune system
- The body's defence against pathogens, which includes the white blood cells.
- Immune deficiency
- A defect in the immune system that makes a person more likely to get infections.
- Pathogen
- A microorganism that causes disease.
- Virus
- A tiny particle that infects a host cell and uses it to make more viruses.
- Bacterium
- A single-celled organism with no nucleus that reproduces by binary fission.
- Protist
- A single-celled organism with a nucleus, many of which are parasites.
- Fungus
- An organism made of threads called hyphae that reproduces by spores.
- Vector
- An organism that carries a pathogen from one host to another without being harmed.
- Spore
- A tiny structure made by a fungus that is carried by wind or water to spread it.
- Toxin
- A poison made by a pathogen that damages the cells of the host.
- Direct contact
- The spread of a pathogen by touching, or through blood or body fluids.
- Ingestion
- Taking food or drink into the body, which can carry pathogens into the gut.