Health & disease (Edexcel GCSE Biology Combined Science): Flashcards
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WHO definition of health
WHO definition of health
Complete physical, mental & social well-being, not merely absence of disease
Communicable disease
Communicable disease
Disease that can spread between individuals
Why one disease increases susceptibility to others
Why one disease increases susceptibility to others
Immune system weakened fighting first disease
Pathogen definition
Pathogen definition
Microorganism that causes disease
4 main types of pathogens
4 main types of pathogens
Viruses, bacteria, fungi, protists
Key characteristic of viruses
Key characteristic of viruses
Non-living particles that kill host cells to reproduce
How bacteria cause disease
How bacteria cause disease
Release toxins that damage tissues or interfere with functions
Pathogen causing malaria
Pathogen causing malaria
Protist
How malaria spreads
How malaria spreads
Mosquitoes act as vectors, passing protist to humans
How tuberculosis spreads
How tuberculosis spreads
Through air when infected individuals cough