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disease
a pathological condition of a part, organ, or system of an organism characterized by an identifiable group of signs or symptoms
pathogen
an organism or particle that causes disease (viruses, bacteria, etc.)
infectious disease
a contagious disease caused by pathogens (flu, measles, chickenpox, malaria)
noninfectious disease
a disease that is not caused by pathogens and is not contagious (Alzheimer's, cancer)
Allergy
an abnormal reaction to a foreign substance
acute
beginning suddenly and lasting for a short time (colds, flu)
chronic
lasting for a long time and/or recurring frequently (cancer, arthritis, diabetes)
bacteria
microorganisms which are typically one-celled, have no chlorophyll, multiply by simple division, and can be seen only with a microscope
virus
a tiny, nonliving particle that can infect cells and cause diseases and cannot be killed with antibiotics
lymphatic system
a major component of the immune system that protects the body from pathogens a rounded mass of tissue that filters fluids from other body tissues and traps pat
lymph node
a rounded mass of tissue that filters fluids from other body tissues and traps pathogens
immunity
the body's ability to protect itself from pathogens before they cause disease
active immunity
the type of immunity in which the immune system produces antibodies in response to the presence of a pathogen. It can last a few years or up to a lifetime
passive immunity
A type of immunity acquired when a person receives antibodies from an outside source. It only lasts for a few months
lymph nodes, adenoids, spleen, bone marrow, lymphatic vessels, tonsils, thymus, appendix
components of the immune and lymphatic systems
immune system, lymphatic system, and cardiovascular system
body systems that work together to defend the body against disease.
