Question

What ions are most abundant in tears, and which ion is found in a much higher concentration in tears compared to serum elsewhere in the body?

Answer 1

The most abundant ions in tears are sodium and chloride. Chloride is found in a much higher concentration in tears compared to serum elsewhere in the body.

Step-by-step explanation:

The most abundant ions in tears are sodium (Na+) and chloride (Cl-).

The ion found in a much higher concentration in tears compared to serum elsewhere in the body is chloride (Cl-).

For example, while the concentration of chloride in tears is around 100-150 mM, the concentration of chloride in blood serum is around 100 mM.