Secretion from surface goblet cells and submucosal glands composed of water,proteins,and glycosylated mucins.

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Gel is a macromolecular description of pseudoplastic material having both viscosity and elasticity.
Mucus is a secretion,from surface goblet cells and submucosal glands,composed of water,proteins,and glycosylated mucins.The glycoprotein portion of the secretion is termed mucin.Mucus (noun)is the secretion;mucous (adjective)is the cell or gland type.
Phlegm is purulent material in the airways.From the Greek word for inflammation.When expectorated,phlegm is called sputum.
Sol or the periciliary layer is the weak gel containing attached mucins that bathes the beating cilia and usually separates that mucus layer from the epithelial surface.
Sputum is expectorated phlegm that contains respiratory tract,oropharyngeal,and nasopharyngeal secretions and bacteria and products of inflammation including polymeric DNA and actin.

Secretion from Surface Goblet Cells and Submucosal Glands Composed of Water,proteins,and