The difference between Saliva and Sputum

When used as nouns, saliva means a clear, slightly alkaline liquid secreted into the mouth by the salivary glands and mucous glands, consisting of water, mucin, protein, and enzymes. it moistens the mouth, lubricates ingested food, and begins the breakdown of starches, whereas sputum means matter coughed up and expectorated from the mouth, composed of saliva and discharges from the respiratory passages such as mucus, phlegm or pus.

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