How does saliva change with reduced pH, reduced buffering capacity and altered electrolyte & protein content?

• A. Becomes more watery
• B. Becomes viscous, white, yellow, or brownish
• C. Becomes sweeter
• D. Becomes more salty

Answer: (B)

When saliva is faced with a lower pH and reduced buffering, its composition shifts toward more concentrated, mucin-rich fluid. Mucins are large glycoproteins that give saliva its lubricating, gel-like quality. With less water available and proteins/electrolytes rearranging, the saliva becomes thicker and more viscous. The increased mucin concentration, together with debris, desquamated cells, and bacterial pigments that can accumulate in the thicker fluid, gives a cloudy or opaque look and can impart white, yellow, or brownish discoloration.

So the best description is a saliva that is viscous and can appear white, yellow, or brownish due to the mucin-rich, gel-like nature and the presence of accumulated material. A watery saliva would imply dilution or higher flow, which doesn’t fit the reduced buffering and altered content. A sweeter or distinctly saltier appearance isn’t the hallmark reaction to these specific changes in pH and protein/electrolyte content.