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any abnormal condition in a living organism causing illness
a disease
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an organism or particle that causes a disease
pathogen
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caused by pathogens and are contagious
infectious disease
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are not caused by pathogens and are not contagious
nonifectious disease
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pathogens are classified into 4 groups:
bacteria, viruses, fungi, and protists
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can spread from person to person, from infected animals, from soil, food or water, and through contaminated objects
pathogens
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can help reduce the spread of diseases
proper hygiene, clean environment, and hand washing
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an illness , such as the flu , begins suddenly and lasts for a short time.
acute
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an illness that lasts along time and is frequent
chronic
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A tiny, nonliving particle that can infect cells and cause disease
virus
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cannot destroy a virus because they are not living and do not reproduce outside of their host's body
antibiotics
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what cannot treat viral infectious disease or noninfectious disease
antibiotics
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How do viruses multiply?
A virus mulltiplies by attaching itself to a cell and injects its genetic material into the cell. This causes the cell to produce copies of the virus. The cell then releases the virus and the cyclebegins again.
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an is a substance that provokes allergies
allergen
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A noninfectious disease
Arthiritus
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Common genetic disorders are
Down syndrome, hemophilia, sickle cell anemia, and color blindness.
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an abnormal reaction to a foreign substance
allergy
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an is a substance that provokes allergies
allergen
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, , , , , and are different types of allergens
pollen dust mold foods medicines and animal dander
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the , , and systems all work together to defend the body against diseases
immune lymphatic and cardiovascular
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when a invades a body, the immune system produces antibodies that help destroy the pathogens
pathogen
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