Health & disease (Edexcel GCSE Biology): Flashcards
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WHO definition of health
WHO definition of health
Complete physical, mental & social well-being (not just absence of disease)
Definition of disease
Definition of disease
Condition where part of organism doesn't function properly
Communicable disease
Communicable disease
Disease that can spread between individuals
Non-communicable disease
Non-communicable disease
Disease that can't spread between individuals
Why does one disease increase susceptibility to others?
Why does one disease increase susceptibility to others?
Weakens immune system & can damage body systems, making infection easier
Definition of pathogen
Definition of pathogen
Microorganism that causes disease
Four main types of pathogens
Four main types of pathogens
Viruses, bacteria, fungi, protists
Key characteristic of viruses
Key characteristic of viruses
Non-living particles that reproduce inside host cells
Key characteristic of bacteria
Key characteristic of bacteria
Single-celled, living microorganisms
How do bacteria cause disease?
How do bacteria cause disease?
Release toxins that damage tissues
How do fungi spread?
How do fungi spread?
Through spores in warm, damp environments
Key characteristic of protists
Key characteristic of protists
Single-celled organisms, often parasites
Cholera pathogen type & transmission
Cholera pathogen type & transmission
Bacterium, spreads via contaminated water
Tuberculosis pathogen & symptoms
Tuberculosis pathogen & symptoms
Bacterium, causes coughing & lung damage
Malaria pathogen & vector
Malaria pathogen & vector
Protist, spread by mosquitoes