| fluids and secretions | Liquid substances produced by living organisms to fulfill specific functions or excreted as waste. Secretions do not include hormones or enzymes. (12 Dec 1998) |
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| body fluids | Liquid components of living organisms. (12 Dec 1998) |
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| transcellular fluids | The fluid's that are not inside cells, but are separated from plasma and interstitial fluid by cellular barriers; e.g., cerebrospinal fluid, synovial fluid, pleural fluid. (05 Mar 2000) |
| labyrinthine fluids | Fluids found within the osseous labyrinth (perilymph) and the membranous labyrinth (endolymph) of the inner ear. (12 Dec 1998) |