Examlex
What is a leading cause of death in developed countries?
Saliva
A watery secretion from the glands in the mouth, aiding in digestion and maintaining oral hygiene.
Innate Immunity
The body's first line of defense against pathogens, which is present from birth and not specific to any particular pathogen.
Foreign Substances
Materials or particles that are not naturally part of the body and can provoke an immune response when introduced.
Microorganisms
Tiny living organisms, often microscopic in size, that include bacteria, viruses, fungi, and protists.
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