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Disease A condition that damages or weakens the body Infectious Diseases Diseases that can be spread from person to person Noninfectious diseases Diseases that don't spread from person to person Pathogen An organism or virus that causes disease Microbes A pathogen that is too small to be seen without a microscope Infection Pathogens that grow and multiply in the body Heredity The passing of characteristics from parent to their child Symptoms Signs and feeling of a disease Viruses The smallest kind of microbes that cause disease Bacteria One -celled living things that can cause disease Fungi Small, simple living things like molds and yeasts Protozoa One-celled organisms that are larger than bacteria Transmitted Spread from person to person, or thing Mucus A thick sticky substance that traps pathogens Cilia Tiny hair-like structures inside breathing passages that move like waves to push pathogens out White Blood Cells Cells in the blood that kill pathogens Immune system Body system that fights disease Antibodies Substances made by the body to help fight disease Immunity The body's ability to remember how to make antibodies to a disease Vaccine Medicine that gives a person immunity to a disease Antibiotic A medicine that kills bacteria Resistance The body's natural ability to fight disease on its own Treatment Special Care for an illness Immunization Giving vaccines to make people immune to disease Booster An extra dose of vaccine Chronic Long lasting health problems Acute Do not last very long Insulin Chemical that helps the body take up sugar from the blood