body systems that work together to defend the body against disease.

beginning suddenly and lasting for a short time (colds, flu)

a disease that is not caused by pathogens and is not contagious (Alzheimer's, cancer)

the body's ability to protect itself from pathogens before they cause disease

microorganisms which are typically one-celled, have no chlorophyll, multiply by simple division, and can be seen only with a microscope

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

a substance that provokes allergies (pollen, mold, dust, certain foods)

a rounded mass of tissue that filters fluids from other body tissues and traps pathogens

an abnormal reaction to a foreign substance

lasting for a long time and/or recurring frequently (cancer, arthritis, diabetes)

a pathological condition of a part, organ, or system of an organism characterized by an identifiable group of signs or symptoms

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