+**Mucus** is a slippery, protective biological [Fluid](/wiki/fluid) secreted by mucous membranes. This viscous gel traps foreign particles and pathogens, acting as a crucial defense of the [Immune System](/wiki/immune_system) while also providing lubrication for vital bodily surfaces.
+## See also
+- [Secretion](/wiki/secretion)
+- [Epithelium](/wiki/epithelium)
+- [Hydration](/wiki/hydration)
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