Which statement best describes the overall composition of saliva?

Which statement best describes the overall composition of saliva?

• A. It is primarily water with about 1% other components
• B. It is primarily lipids
• C. It contains no minerals
• D. It is produced only during meals

Answer: (A)

Saliva is a watery secretion, and its bulk is water. The small fraction of dissolved substances—electrolytes such as bicarbonate, sodium, and potassium; minerals like calcium and phosphate; enzymes like amylase; mucus-forming glycoproteins (mucins); and antimicrobial proteins—make up roughly about one percent of the fluid. This composition supports its roles: lubrication for swallowing, buffering to protect teeth from acids, minerals for remineralization of enamel, and initial digestion, all while helping limit microbial growth. It isn’t dominated by lipids, minerals are present in small amounts, and saliva is produced continuously, not only during meals.

Saliva is a watery secretion, and its bulk is water. The small fraction of dissolved substances—electrolytes such as bicarbonate, sodium, and potassium; minerals like calcium and phosphate; enzymes like amylase; mucus-forming glycoproteins (mucins); and antimicrobial proteins—make up roughly about one percent of the fluid. This composition supports its roles: lubrication for swallowing, buffering to protect teeth from acids, minerals for remineralization of enamel, and initial digestion, all while helping limit microbial growth. It isn’t dominated by lipids, minerals are present in small amounts, and saliva is produced continuously, not only during meals.