Secretion of magnesium by dog parotid gland

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Abstract
Prolonged, steady secretion of saliva results in a decrease in magnesium concentration until a steady state is reached after about 40 min. During this period the glandular concentration of magnesium also diminishes. The salivary magnesium concentration increases as the rate of flow decreases. This effect is most marked at flows below about 0.2 ml/min. The amount of magnesium in saliva varies directly with that in plasma. Since over a wide range of magnesium plasma concentrations the saliva/plasma ratio is approximately one, and because no change in concentration occurs during the stop flow procedure, it is suggested that the salivary secretion of magnesium is a passive process. Stop flow studies using Mg28 indicate that the primary site for transport of magnesium from plasma to saliva is in the intralobular ducts. These results are consistent with the hypothesis that electrolytes are transferred from plasma to saliva primarily by activity of the duct cells, that these processes are not coupled, and that they can proceed at varying and independent rates.

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