Saliva | Oral Health, Digestion & Enzymes | Britannica
https://www.britannica.com/science/saliva
Websaliva, a thick, colourless, opalescent fluid that is constantly present in the mouth of humans and other vertebrates. It is composed of water, mucus, proteins, mineral salts, and amylase. As saliva circulates in the mouth cavity it picks up food debris, bacterial cells, and white blood cells.
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