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The muscle cells of a marathon runner's legs would exhibit all these characteristics except
Tears
The liquid secreted by the lacrimal glands of the eye, functioning in lubrication, nourishment, and protection of the eye surface.
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.
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