Physiology MCQ Answer 36
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The striated ducts in the salivary glands absorb Na+ and Cl-, making saliva hypotonic to plasma. When flow rate increases, however, there is less time for this absorption to occur. So there are increased concentrations of Na+ and Cl- at higher flow rates. Salivary secretion is under total autonomic nervous system control. It is unusual in that both the parasympathetic and sympathetic systems stimulate secretion, but the stimulation by the sympathetic system is transient. The volume of secretions relative to the mass of the glands is very large.
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